Re: IP unnumbered for HDLC connection [7:62134]
I think support for /31 masks was introduced in 12.2.8 though I'm sure someone will correct me if I'm mistaken;) Dave s vermill wrote: MADMAN wrote: Glad you got it figured out and I hope you learned some reason(s) not to do unnumbered. I can't think of and good reasons for it and if you running out of addresses I have an RFC full of them for you;) Dave, I heard rumor to the effect that Cisco would introduce /31 mask support for serial p-t-p links. Anyone tried that yet? I keep forgeting to when on a router with shiny new IOS. Scott Dave Deepak N wrote: Hi Vermill Now I got the point. So when i am using the numbered interface, the router tries to reach the next hop via the next hop ip address, in my case it is behind the directly connected interface.But it has no way of finding the next hop ip address behind the unnumbered interface. So it was not able to reach the other end. While both are unnumbered, the routes were installed based on the outgoing interface. Thank you all for helping me out to find the solution. Thanks n regards Deepak -- David Madland CCIE# 2016 Sr. Network Engineer Qwest Communications 612-664-3367 You don't make the poor richer by making the rich poorer. --Winston Churchill -- David Madland CCIE# 2016 Sr. Network Engineer Qwest Communications 612-664-3367 You don't make the poor richer by making the rich poorer. --Winston Churchill Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=62250t=62134 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP unnumbered for HDLC connection [7:62134]
If it is a loopback address lets say 192.168.1.2 255.255.255.252 the router will see the netblock local to the router. Lets say the other end is 192.168.1.1 255.255.255.252 Point-to-point. Try putting a route statement ip route 192.168.1.1 255.255.255.255 out the interface. This creates a more specific route for that IP. Daniel Ladrach CCNP,CCNA WorldCom -Original Message- From: Deepak N [mailto:[EMAIL PROTECTED]] Sent: Wednesday, January 29, 2003 4:07 PM To: [EMAIL PROTECTED] Subject: IP unnumbered for HDLC connection [7:62134] HI All I have simple configuration of HDLC connected back to back. If i give ip unnumbered at one end and the static ip address at the other end, I cant ping the either end. But when i give show ip int brief, it shows the line and protocol are up. If i give ip unnumbered at both ends, now i am able to ping either end. could anybody help me out in this. Regards Deepak Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=62181t=62134 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP unnumbered for HDLC connection [7:62134]
Hi Ladrach I tried with the route statement. it worked perfectly. but the problem is when i am running the routing protocol. i have given detailed configs for 3 different cases in the previous mails. Regards Deepak Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=62193t=62134 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP unnumbered for HDLC connection [7:62134]
Deepak N wrote: HI All I have simple configuration of HDLC connected back to back. If i give ip unnumbered at one end and the static ip address at the other end, I cant ping the either end. But when i give show ip int brief, it shows the line and protocol are up. If i give ip unnumbered at both ends, now i am able to ping either end. could anybody help me out in this. Regards Deepak This stuff is impossible to remember. Everytime I think I have it committed to memory, I wind up back at: http://www.cisco.com/en/US/tech/tk648/tk365/technologies_tech_note09186a0080094e8d.shtml An interesting excerpt: The only real disadvantage that the unnumbered interface suffers from is that it is unavailable for remote testing and management. But more importantly: When unnumbered is used, a route that is learned via the unnumbered interace is placed into the routing table using the unnumbered _interface_ it came in on as opposed to the next hop IP. If the next hop IP were to be used, problems would arrise because tit isn't directly attached (everything eventually has to boil down to a directly attached interface so the packet can be offloaded). The next hop IP is on the back side of the distant-end unnumbered interface. Unnumbered was meant to conserve address space on p-t-p serial links. It was assumed that both ends would implement it. In the case of a numbered interface, the use the interface instead of next hop IP logic isn't implemented. Thus, the router inserts the next hop (which is behind the unnumbered inteface on the other end). The problem, of course, is that the next hop isn't directly attached. And no special logic has been implemented to compensate. I think I got that right. Read the link and see if it adds up. Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=62194t=62134 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP unnumbered for HDLC connection [7:62134]
Hi Vermill Now I got the point. So when i am using the numbered interface, the router tries to reach the next hop via the next hop ip address, in my case it is behind the directly connected interface.But it has no way of finding the next hop ip address behind the unnumbered interface. So it was not able to reach the other end. While both are unnumbered, the routes were installed based on the outgoing interface. Thank you all for helping me out to find the solution. Thanks n regards Deepak Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=62197t=62134 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP unnumbered for HDLC connection [7:62134]
Deepak N wrote: Hi Vermill Now I got the point. So when i am using the numbered interface, the router tries to reach the next hop via the next hop ip address, in my case it is behind the directly connected interface.But it has no way of finding the next hop ip address behind the unnumbered interface. So it was not able to reach the other end. While both are unnumbered, the routes were installed based on the outgoing interface. Thank you all for helping me out to find the solution. Thanks n regards Deepak Yes, I think you have it. But I was interested in some other suggestions that were made. If, on the numbered end, you entered a static route to the unnumbered interface IP using the outgoing interface, it seems like it might work. Something like: 'ip route 192.168.100.1 s0' where 192.168.100.1 was the IP of the interface being referenced in the 'ip unnumbered' statement and s0 attaches to the unnumbered interface. But something might break in the routing protocol. Again, I think it was assumed that you're going to implement unnumbered on both ends of the link in order to realize address conservation. There might also be some exchanges of information between the unnumbered interfaces that we're not aware of. An asymetrical configuration might break that. Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=62199t=62134 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: IP unnumbered for HDLC connection [7:62134]
Glad you got it figured out and I hope you learned some reason(s) not to do unnumbered. I can't think of and good reasons for it and if you running out of addresses I have an RFC full of them for you;) Dave Deepak N wrote: Hi Vermill Now I got the point. So when i am using the numbered interface, the router tries to reach the next hop via the next hop ip address, in my case it is behind the directly connected interface.But it has no way of finding the next hop ip address behind the unnumbered interface. So it was not able to reach the other end. While both are unnumbered, the routes were installed based on the outgoing interface. Thank you all for helping me out to find the solution. Thanks n regards Deepak -- David Madland CCIE# 2016 Sr. Network Engineer Qwest Communications 612-664-3367 You don't make the poor richer by making the rich poorer. --Winston Churchill Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=62207t=62134 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: IP unnumbered for HDLC connection [7:62134]
MADMAN wrote: Glad you got it figured out and I hope you learned some reason(s) not to do unnumbered. I can't think of and good reasons for it and if you running out of addresses I have an RFC full of them for you;) Dave, I heard rumor to the effect that Cisco would introduce /31 mask support for serial p-t-p links. Anyone tried that yet? I keep forgeting to when on a router with shiny new IOS. Scott Dave Deepak N wrote: Hi Vermill Now I got the point. So when i am using the numbered interface, the router tries to reach the next hop via the next hop ip address, in my case it is behind the directly connected interface.But it has no way of finding the next hop ip address behind the unnumbered interface. So it was not able to reach the other end. While both are unnumbered, the routes were installed based on the outgoing interface. Thank you all for helping me out to find the solution. Thanks n regards Deepak -- David Madland CCIE# 2016 Sr. Network Engineer Qwest Communications 612-664-3367 You don't make the poor richer by making the rich poorer. --Winston Churchill Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=62214t=62134 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: IP unnumbered for HDLC connection [7:62134]
In mail.net.groupstudy.pro, you wrote: I heard rumor to the effect that Cisco would introduce /31 mask support for serial p-t-p links. Anyone tried that yet? I keep forgeting to when on a router with shiny new IOS. It works well on all platforms I've used it on. Introduced in 12.2(2)T, ie. a long time ago ;-) // kaj Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=62218t=62134 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: IP unnumbered for HDLC connection [7:62134]
[EMAIL PROTECTED] (Kaj J. Niemi) wrote: In mail.net.groupstudy.pro, you wrote: I heard rumor to the effect that Cisco would introduce /31 mask support for serial p-t-p links. Anyone tried that yet? I keep forgeting to when on a router with shiny new IOS. It works well on all platforms I've used it on. Introduced in 12.2(2)T, Cool! ie. a long time ago ;-) Yeah, most of my clients are of the if it aint broke, don't upgrade it mentality. And a lot of my lab stuff doesn't have enough memory to go beyond 12.1. I'm often times 6 or more months behind the curve on IOS. Thanks for the update. // kaj Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=62219t=62134 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP unnumbered for HDLC connection [7:62134]
Hi Deepak When you configure ip unnnumbered on an interfaces it looks like an interface with a /0 mask. On the other side with a configured ip address on the interface you have a different mask. So the two connected interfaces don't belong to the same network. What you could do is to configure on the router with the static ip address a route outwards the connecting interface for the other router's network. But I have never tried this before. The interface an line protocol will come undependently of the configured ip address. see you Claudio Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=62135t=62134 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP unnumbered for HDLC connection [7:62134]
Hi Claudio Thanks for quick response. But i have tried that options. i defined a static ip route to the network on the other end through the connecting interface.it did work. But when i am using the routing protocol, i am not able to ping either end. But if i make the other end also unnumbered, n run the routing protocol, then i am able to ping either end. Regards Deepak Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=62137t=62134 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP unnumbered for HDLC connection [7:62134]
Which is failing to get to the other side? The ping (echo) or the ping reply (echo reply). Pinging could fail for either reason. Debug icmp and you might get more info. Also, send us your configs. Help us help you. Priscilla Deepak N wrote: Hi Claudio Thanks for quick response. But i have tried that options. i defined a static ip route to the network on the other end through the connecting interface.it did work. But when i am using the routing protocol, i am not able to ping either end. But if i make the other end also unnumbered, n run the routing protocol, then i am able to ping either end. Regards Deepak Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=62142t=62134 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP unnumbered for HDLC connection [7:62134]
Hi What kind of routing protocol are you using? Ospf can not build an adjacency this way. With other routing protocols you should be able to exchange routing tables. But you won't be able to send traffic, because the router does not know where the next-hop address is. So you still need this static route to tell the router where the next-hop address is reachable. see you Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=62143t=62134 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP unnumbered for HDLC connection [7:62134]
Hi all The following are the configurations of the routers and the ping outputs. I have given 3 cases. 1) When ip unnumbered at one end and static routes are defined sdmheadend#sh run Building configuration... Current configuration : 1115 bytes ! version 12.2 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname sdmheadend ! ! ! ! ip subnet-zero ! ! ! ip audit notify log ip audit po max-events 100 ! ! ! voice call carrier capacity active ! ! ! ! ! ! ! ! ! mta receive maximum-recipients 0 ! ! ! ! interface FastEthernet0/0 ip address 172.20.110.10 255.255.255.192 duplex auto speed auto ! interface FastEthernet0/1 no ip address shutdown duplex auto speed auto ! interface ATM1/0 no ip address shutdown no atm ilmi-keepalive dsl operating-mode auto no fair-queue ! interface FastEthernet1/0 no ip address shutdown duplex auto speed auto ! interface Serial1/0 ip address 12.12.12.1 255.255.255.0 no fair-queue clockrate 200 ! interface FastEthernet1/1 no ip address shutdown duplex auto speed auto ! interface Serial1/1 no ip address shutdown clockrate 200 ! ip classless ip route 200.200.200.0 255.255.255.0 Serial1/0 ip http server ! ! ! ! call rsvp-sync ! ! mgcp profile default ! dial-peer cor custom ! ! ! ! ! line con 0 line aux 0 line vty 0 4 ! ! end sdmheadend# ping 200.200.200.11 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 200.200.200.11, timeout is 2 seconds: ! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms sdmheadend# switchrouter#sh run Building configuration... Current configuration : 746 bytes ! version 12.2 service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname switchrouter ! ! memory-size iomem 5 ip subnet-zero ! ! ! ip audit notify log ip audit po max-events 100 ip ssh time-out 120 ip ssh authentication-retries 3 ! ! ! ! ! ! ! ! ! ! ! interface Loopback0 ip address 200.200.200.11 255.255.255.0 ! interface FastEthernet0/0 no ip address shutdown speed auto ! interface Serial0/0 ip unnumbered Loopback0 no fair-queue ! interface Serial0/1 no ip address shutdown ! ip classless ip route 12.12.12.0 255.255.255.0 Serial0/0 no ip http server ip pim bidir-enable ! ! ! call rsvp-sync ! dial-peer cor custom ! ! ! ! line con 0 line aux 0 line vty 0 4 ! no scheduler allocate end switchrouter#ping 12.12.12.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 12.12.12.1, timeout is 2 seconds: ! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms switchrouter# 2) When routing protocol RIP is running sdmheadend#sh run Building configuration... Current configuration : 1099 bytes ! version 12.2 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname sdmheadend ! ! ! ! ip subnet-zero ! ! ! ip audit notify log ip audit po max-events 100 ! ! ! voice call carrier capacity active ! ! ! ! ! ! ! ! ! mta receive maximum-recipients 0 ! ! ! ! interface FastEthernet0/0 ip address 172.20.110.10 255.255.255.192 duplex auto speed auto ! interface FastEthernet0/1 no ip address shutdown duplex auto speed auto ! interface ATM1/0 no ip address shutdown no atm ilmi-keepalive dsl operating-mode auto no fair-queue ! interface FastEthernet1/0 no ip address shutdown duplex auto speed auto ! interface Serial1/0 ip address 12.12.12.1 255.255.255.0 no fair-queue clockrate 200 ! interface FastEthernet1/1 no ip address shutdown duplex auto speed auto ! interface Serial1/1 no ip address shutdown clockrate 200 ! router rip network 12.0.0.0 ! ip classless ip http server ! ! ! ! call rsvp-sync ! ! mgcp profile default ! dial-peer cor custom ! ! ! ! ! line con 0 line aux 0 line vty 0 4 ! ! end sdmheadend# ping 200.200.200.11 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 200.200.200.11, timeout is 2 seconds: . Success rate is 0 percent (0/5) sdmheadend# switchrouter#sh run Building configuration... Current configuration : 738 bytes ! version 12.2 service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname switchrouter ! ! memory-size iomem 5 ip subnet-zero ! ! ! ip audit notify log ip audit po max-events 100 ip ssh time-out 120 ip ssh authentication-retries 3 ! ! ! ! ! ! ! ! ! ! ! interface Loopback0 ip address 200.200.200.11 255.255.255.0 ! interface FastEthernet0/0 no ip address shutdown speed auto ! interface Serial0/0 ip unnumbered Loopback0 no fair-queue ! interface Serial0/1 no ip address shutdown ! router rip network 200.200.200.0 ! ip classless no ip http server ip pim bidir-enable ! ! ! call rsvp-sync ! dial-peer cor custom ! ! ! ! line con 0 line aux 0 line vty 0 4 ! no scheduler allocate end switchrouter#ping 12.12.12.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 12.12.12.1, timeout is
RE: IP unnumbered for HDLC connection [7:62134]
Hi Give us a look at the routing table from both routers. The router with the configured ip address on the Serial interface does not know how to get to the next hop address. Do you see in the routing table the next-hop address or the outbound interface? see you Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=62151t=62134 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP unnumbered for HDLC connection [7:62134]
So it fails when you have numbered on one side and unnumbered on the other side and you are running RIP? What did show ip route tell you when the problem occured? Were the relevant routes in both routers' tables? What address does sdmheadend use to send the echo? If it's using 172.20.110.10, then it won't work because switchrouter doesn't have a route back to that. It only has a route back to 12.0.0.0? With extended ping you can set the ip address that the router should use. Also, enable debug ip icmp (on a non-operational router anyway) and see what's really happening. Also, see the last message from Claudio. It may have something to do with sdmheadend not having a valid next hop address since its next hop is unnumbered, but then we would expect when they are both unnumbered and the loopbacks are in different subnets, there would be a problem too, and there isn't. Anyway, show ip route should tell you a lot. Priscilla Deepak N wrote: Hi all The following are the configurations of the routers and the ping outputs. I have given 3 cases. 1) When ip unnumbered at one end and static routes are defined sdmheadend#sh run Building configuration... Current configuration : 1115 bytes ! version 12.2 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname sdmheadend ! ! ! ! ip subnet-zero ! ! ! ip audit notify log ip audit po max-events 100 ! ! ! voice call carrier capacity active ! ! ! ! ! ! ! ! ! mta receive maximum-recipients 0 ! ! ! ! interface FastEthernet0/0 ip address 172.20.110.10 255.255.255.192 duplex auto speed auto ! interface FastEthernet0/1 no ip address shutdown duplex auto speed auto ! interface ATM1/0 no ip address shutdown no atm ilmi-keepalive dsl operating-mode auto no fair-queue ! interface FastEthernet1/0 no ip address shutdown duplex auto speed auto ! interface Serial1/0 ip address 12.12.12.1 255.255.255.0 no fair-queue clockrate 200 ! interface FastEthernet1/1 no ip address shutdown duplex auto speed auto ! interface Serial1/1 no ip address shutdown clockrate 200 ! ip classless ip route 200.200.200.0 255.255.255.0 Serial1/0 ip http server ! ! ! ! call rsvp-sync ! ! mgcp profile default ! dial-peer cor custom ! ! ! ! ! line con 0 line aux 0 line vty 0 4 ! ! end sdmheadend# ping 200.200.200.11 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 200.200.200.11, timeout is 2 seconds: ! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms sdmheadend# switchrouter#sh run Building configuration... Current configuration : 746 bytes ! version 12.2 service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname switchrouter ! ! memory-size iomem 5 ip subnet-zero ! ! ! ip audit notify log ip audit po max-events 100 ip ssh time-out 120 ip ssh authentication-retries 3 ! ! ! ! ! ! ! ! ! ! ! interface Loopback0 ip address 200.200.200.11 255.255.255.0 ! interface FastEthernet0/0 no ip address shutdown speed auto ! interface Serial0/0 ip unnumbered Loopback0 no fair-queue ! interface Serial0/1 no ip address shutdown ! ip classless ip route 12.12.12.0 255.255.255.0 Serial0/0 no ip http server ip pim bidir-enable ! ! ! call rsvp-sync ! dial-peer cor custom ! ! ! ! line con 0 line aux 0 line vty 0 4 ! no scheduler allocate end switchrouter#ping 12.12.12.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 12.12.12.1, timeout is 2 seconds: ! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms switchrouter# 2) When routing protocol RIP is running sdmheadend#sh run Building configuration... Current configuration : 1099 bytes ! version 12.2 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname sdmheadend ! ! ! ! ip subnet-zero ! ! ! ip audit notify log ip audit po max-events 100 ! ! ! voice call carrier capacity active ! ! ! ! ! ! ! ! ! mta receive maximum-recipients 0 ! ! ! ! interface FastEthernet0/0 ip address 172.20.110.10 255.255.255.192 duplex auto speed auto ! interface FastEthernet0/1 no ip address shutdown duplex auto speed auto ! interface ATM1/0 no ip address shutdown no atm ilmi-keepalive dsl operating-mode auto no fair-queue ! interface FastEthernet1/0 no ip address shutdown duplex auto speed auto ! interface Serial1/0 ip address 12.12.12.1 255.255.255.0 no fair-queue clockrate 200 ! interface FastEthernet1/1 no ip address shutdown duplex auto speed auto ! interface Serial1/1 no ip address shutdown clockrate 200 ! router rip network 12.0.0.0 ! ip classless ip
RE: IP unnumbered for HDLC connection [7:62134]
HI Claudio Please find the following for the different cases i mentioned. Regards Deepak 1)When ip unnumbered at one end and static routes are defined sdmheadend#sh ip rou Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area * - candidate default, U - per-user static route, o - ODR P - periodic downloaded static route Gateway of last resort is not set S200.200.200.0/24 is directly connected, Serial1/0 172.20.0.0/26 is subnetted, 1 subnets C 172.20.110.0 is directly connected, FastEthernet0/0 12.0.0.0/24 is subnetted, 1 subnets C 12.12.12.0 is directly connected, Serial1/0 sdmheadend# switchrouter#sh ip rou Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area * - candidate default, U - per-user static route, o - ODR P - periodic downloaded static route Gateway of last resort is not set C200.200.200.0/24 is directly connected, Loopback0 12.0.0.0/24 is subnetted, 1 subnets S 12.12.12.0 is directly connected, Serial0/0 switchrouter# 2)When routing protocol RIP is running sdmheadend#sh ip rout Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area * - candidate default, U - per-user static route, o - ODR P - periodic downloaded static route Gateway of last resort is not set 172.20.0.0/26 is subnetted, 1 subnets C 172.20.110.0 is directly connected, FastEthernet0/0 12.0.0.0/24 is subnetted, 1 subnets C 12.12.12.0 is directly connected, Serial1/0 sdmheadend# switchrouter#sh ip rou Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area * - candidate default, U - per-user static route, o - ODR P - periodic downloaded static route Gateway of last resort is not set C200.200.200.0/24 is directly connected, Loopback0 switchrouter# 3)When both sides are unnumbered and running routing protocol sdmheadend#sh ip rou Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area * - candidate default, U - per-user static route, o - ODR P - periodic downloaded static route Gateway of last resort is not set R200.200.200.0/24 [120/1] via 200.200.200.11, 00:00:03, Serial1/0 20.0.0.0/24 is subnetted, 1 subnets C 20.20.20.0 is directly connected, Loopback0 172.20.0.0/26 is subnetted, 1 subnets C 172.20.110.0 is directly connected, FastEthernet0/0 sdmheadend# switchrouter#sh ip rou Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area * - candidate default, U - per-user static route, o - ODR P - periodic downloaded static route Gateway of last resort is not set C200.200.200.0/24 is directly connected, Loopback0 20.0.0.0/8 is variably subnetted, 2 subnets, 2 masks R 20.20.20.0/32 [120/1] via 20.20.20.1, 00:00:01, Serial0/0 R 20.0.0.0/8 [120/1] via 20.20.20.1, 00:00:01, Serial0/0 switchrouter# Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=62157t=62134 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP unnumbered for HDLC connection [7:62134]
Hi when i did debug ip icmp, i got the message that its unroutable when one end is numbered and the other end is unnumbered. This is expected because it doesnt have the next hop ip address to reach. But i expect the same behaviour when both are unnumbered. But it is able to send the rip updates and receive also therby reaching both ends. This is somewhat strange Regards Deepak Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=62159t=62134 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP unnumbered for HDLC connection [7:62134]
Do these labs for better understanding... http://www.cisco.com/en/US/tech/tk648/tk365/technologies_tech_note09186a 0080094e8d.shtml WATCH THE WORD WRAP! Deepak N wrote: Hi all The following are the configurations of the routers and the ping outputs. I have given 3 cases. 1) When ip unnumbered at one end and static routes are defined sdmheadend#sh run Building configuration... Current configuration : 1115 bytes ! version 12.2 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname sdmheadend ! ! ! ! ip subnet-zero ! ! ! ip audit notify log ip audit po max-events 100 ! ! ! voice call carrier capacity active ! ! ! ! ! ! ! ! ! mta receive maximum-recipients 0 ! ! ! ! interface FastEthernet0/0 ip address 172.20.110.10 255.255.255.192 duplex auto speed auto ! interface FastEthernet0/1 no ip address shutdown duplex auto speed auto ! interface ATM1/0 no ip address shutdown no atm ilmi-keepalive dsl operating-mode auto no fair-queue ! interface FastEthernet1/0 no ip address shutdown duplex auto speed auto ! interface Serial1/0 ip address 12.12.12.1 255.255.255.0 no fair-queue clockrate 200 ! interface FastEthernet1/1 no ip address shutdown duplex auto speed auto ! interface Serial1/1 no ip address shutdown clockrate 200 ! ip classless ip route 200.200.200.0 255.255.255.0 Serial1/0 ip http server ! ! ! ! call rsvp-sync ! ! mgcp profile default ! dial-peer cor custom ! ! ! ! ! line con 0 line aux 0 line vty 0 4 ! ! end sdmheadend# ping 200.200.200.11 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 200.200.200.11, timeout is 2 seconds: ! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms sdmheadend# switchrouter#sh run Building configuration... Current configuration : 746 bytes ! version 12.2 service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname switchrouter ! ! memory-size iomem 5 ip subnet-zero ! ! ! ip audit notify log ip audit po max-events 100 ip ssh time-out 120 ip ssh authentication-retries 3 ! ! ! ! ! ! ! ! ! ! ! interface Loopback0 ip address 200.200.200.11 255.255.255.0 ! interface FastEthernet0/0 no ip address shutdown speed auto ! interface Serial0/0 ip unnumbered Loopback0 no fair-queue ! interface Serial0/1 no ip address shutdown ! ip classless ip route 12.12.12.0 255.255.255.0 Serial0/0 no ip http server ip pim bidir-enable ! ! ! call rsvp-sync ! dial-peer cor custom ! ! ! ! line con 0 line aux 0 line vty 0 4 ! no scheduler allocate end switchrouter#ping 12.12.12.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 12.12.12.1, timeout is 2 seconds: ! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms switchrouter# 2) When routing protocol RIP is running sdmheadend#sh run Building configuration... Current configuration : 1099 bytes ! version 12.2 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname sdmheadend ! ! ! ! ip subnet-zero ! ! ! ip audit notify log ip audit po max-events 100 ! ! ! voice call carrier capacity active ! ! ! ! ! ! ! ! ! mta receive maximum-recipients 0 ! ! ! ! interface FastEthernet0/0 ip address 172.20.110.10 255.255.255.192 duplex auto speed auto ! interface FastEthernet0/1 no ip address shutdown duplex auto speed auto ! interface ATM1/0 no ip address shutdown no atm ilmi-keepalive dsl operating-mode auto no fair-queue ! interface FastEthernet1/0 no ip address shutdown duplex auto speed auto ! interface Serial1/0 ip address 12.12.12.1 255.255.255.0 no fair-queue clockrate 200 ! interface FastEthernet1/1 no ip address shutdown duplex auto speed auto ! interface Serial1/1 no ip address shutdown clockrate 200 ! router rip network 12.0.0.0 ! ip classless ip http server ! ! ! ! call rsvp-sync ! ! mgcp profile default ! dial-peer cor custom ! ! ! ! ! line con 0 line aux 0 line vty 0 4 ! ! end sdmheadend# ping 200.200.200.11 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 200.200.200.11, timeout is 2 seconds: . Success rate is 0 percent (0/5) sdmheadend# switchrouter#sh run Building configuration... Current configuration : 738 bytes ! version 12.2 service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname switchrouter ! ! memory-size iomem 5 ip subnet-zero ! ! ! ip audit notify log ip audit po max-events 100 ip ssh time-out 120 ip ssh authentication-retries 3 ! ! ! ! ! ! ! ! ! ! ! interface
Re: ip unnumbered [7:48894]
recall that the link between you and whomever is a two host network. if you were numbering, you would most likely use a /30. even when connecting to the internet, this link need not use public IP space. Your ISP is most likely using a static route to you, and you in turn are using a static route to them. them: ip route your public space out interface X You: ip route 0.0.0.0 0.0.0.0 interface Y this is a regular practice. IP unnumbered is even better, because then no one has to commit to or agree upon address, and no one has to waste public space. Usually, you would number your ethernet port with a public number, and you would use an ip unnumbered off that publicly addressed interface. HTH richard dumoulin wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Hey guys, I have to connect a Cisco router to the internet (Worldcom) and I was told the following If your router is a CISCO model, then there is no need to assign actual IP addresses to the WAN serial interfaces since CISCO's un-numbered technology can be employed. Does this mean that I can configure IP unnumbered ethernet0 or loopback0 (with one of them having a routable IP address) and so I must configure ppp encap on the serial ?? I am a bit confused, thx for your help !! Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=48903t=48894 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: ip unnumbered [7:48894]
You can use ip unnumbered with or without PPP, depending on how your provider is set up. You would just use ip unnumbered to the ethernet port or to a loopback interface, whichever you prefer, I prefer the loopback. *-Original Message- *From: richard dumoulin [mailto:[EMAIL PROTECTED]] *Sent: Tuesday, July 16, 2002 5:32 AM *To: [EMAIL PROTECTED] *Subject: ip unnumbered [7:48894] * * *Hey guys, *I have to connect a Cisco router to the internet (Worldcom) *and I was told *the following If your router is a CISCO model, then there is no *need to assign actual IP addresses to the WAN serial *interfaces since CISCO's un-numbered technology can *be employed. Does this mean that I can configure IP *unnumbered ethernet0 or *loopback0 (with one of them having a routable IP address) and so I must *configure ppp encap on the serial ?? * *I am a bit confused, thx for your help !! * * Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=48907t=48894 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: ip unnumbered [7:48894]
Chuck wrote: recall that the link between you and whomever is a two host network. And I would add to that, recall that the link is just a transit for end-to-end traffic. With the exception of network management, it doesn't matter what the network-layer addressing is on that link. It carries host-to-host traffic which is identified by the network-layer addresses of the end hosts. What I'm trying to get at is that you may be concerned because of a common misconception that the network-layer addressing changes from hop-to-hop, which it doesn't. (If you're studying for CCIE, then of course you wouldn't have that micsonception, but I don't know how far you are in your studies yet. :-) Now, network management is a concern, however. If your serial interface is unnumbered, you can't ping it or send it SNMP messages. With those functions, the serial port acts as an end host and must have a network-layer address. That's the tradeoff. As Chuck says, it's common practice to use unnumbered with static and default routing pointing to the interface, however. So many people take the tradeoff. Even though you can't ping the serial interface, you can still get a lot of info from it with the show interface command. Priscilla Oppenheimer http://www.priscilla.com if you were numbering, you would most likely use a /30. even when connecting to the internet, this link need not use public IP space. Your ISP is most likely using a static route to you, and you in turn are using a static route to them. them: ip route your public space out interface X You: ip route 0.0.0.0 0.0.0.0 interface Y this is a regular practice. IP unnumbered is even better, because then no one has to commit to or agree upon address, and no one has to waste public space. Usually, you would number your ethernet port with a public number, and you would use an ip unnumbered off that publicly addressed interface. HTH richard dumoulin wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Hey guys, I have to connect a Cisco router to the internet (Worldcom) and I was told the following If your router is a CISCO model, then there is no need to assign actual IP addresses to the WAN serial interfaces since CISCO's un-numbered technology can be employed. Does this mean that I can configure IP unnumbered ethernet0 or loopback0 (with one of them having a routable IP address) and so I must configure ppp encap on the serial ?? I am a bit confused, thx for your help !! Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=48936t=48894 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: ip unnumbered [7:48894]
Comments inline: *-Original Message- *From: Priscilla Oppenheimer [mailto:[EMAIL PROTECTED]] *Sent: Tuesday, July 16, 2002 1:32 PM *To: [EMAIL PROTECTED] *Subject: Re: ip unnumbered [7:48894] * * *Chuck wrote: * * recall that the link between you and whomever is a two host * network. * *And I would add to that, recall that the link is just a transit for *end-to-end traffic. With the exception of network management, *it doesn't *matter what the network-layer addressing is on that link. It carries *host-to-host traffic which is identified by the network-layer *addresses of *the end hosts. * *What I'm trying to get at is that you may be concerned because *of a common *misconception that the network-layer addressing changes from *hop-to-hop, *which it doesn't. (If you're studying for CCIE, then of course *you wouldn't *have that micsonception, but I don't know how far you are in *your studies *yet. :-) * *Now, network management is a concern, however. If your serial *interface is *unnumbered, you can't ping it or send it SNMP messages. With those *functions, the serial port acts as an end host and must have a *network-layer *address. That's the tradeoff. As Chuck says, it's common *practice to use *unnumbered with static and default routing pointing to the interface, *however. So many people take the tradeoff. Even though you *can't ping the *serial interface, you can still get a lot of info from it with the show *interface command. As Priscilla states, a ping monitor wouldn't work for the serial interface, but you can still poll the router via SNMP using a loopback or other interface network layer address for the status of the unnumbered interface. So if your monitoring system is using the output of the SNMP interface status, you can still monitor the interface. * * * *Priscilla Oppenheimer *http://www.priscilla.com * * * * if you * were numbering, you would most likely use a /30. even when * connecting to the * internet, this link need not use public IP space. Your ISP is * most likely * using a static route to you, and you in turn are using a static * route to * them. * * them: ip route your public space out interface X * * You: ip route 0.0.0.0 0.0.0.0 interface Y * * this is a regular practice. * * IP unnumbered is even better, because then no one has to commit * to or agree * upon address, and no one has to waste public space. * * Usually, you would number your ethernet port with a public * number, and you * would use an ip unnumbered off that publicly addressed * interface. * * HTH * * * * richard dumoulin wrote in message * [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... * Hey guys, * I have to connect a Cisco router to the internet (Worldcom) * and I was told * the following If your router is a CISCO model, then there is * no * need to assign actual IP addresses to the WAN serial * interfaces since CISCO's un-numbered technology can * be employed. Does this mean that I can configure IP * unnumbered ethernet0 * or * loopback0 (with one of them having a routable IP address) and * so I must * configure ppp encap on the serial ?? * * I am a bit confused, thx for your help !! * * * * * * Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=48942t=48894 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP unnumbered [7:48894]
Depending what your provider is selling you, If the provider offers you an IP address for the WAN take, it as it makes things easier to troubleshoot. You usually use IP unnumbered on point to point links where the traffic doesn't need to use the address because it is point to point and can really go anywhere else.Or in here used for dial in connections for ISDN, where the dial in client dials the number of the router and is assigned IP addresses from dial in pool, and the WAN interface is referenced using a unnumbered loopback 0 If you are dialing to your provider, you can use the IP negotiate on the wan interface, and when you dial your provider he assigned you the address dynamically and you can NAT of this, ( This is a clever solution).. its called easy IP Kind regards. -Original Message- From: Lupi, Guy [SMTP:[EMAIL PROTECTED]] Sent: 16 July 2002 15:38 To: [EMAIL PROTECTED] Subject: RE: ip unnumbered [7:48894] You can use ip unnumbered with or without PPP, depending on how your provider is set up. You would just use ip unnumbered to the ethernet port or to a loopback interface, whichever you prefer, I prefer the loopback. *-Original Message- *From: richard dumoulin [mailto:[EMAIL PROTECTED]] *Sent: Tuesday, July 16, 2002 5:32 AM *To: [EMAIL PROTECTED] *Subject: ip unnumbered [7:48894] * * *Hey guys, *I have to connect a Cisco router to the internet (Worldcom) *and I was told *the following If your router is a CISCO model, then there is no *need to assign actual IP addresses to the WAN serial *interfaces since CISCO's un-numbered technology can *be employed. Does this mean that I can configure IP *unnumbered ethernet0 or *loopback0 (with one of them having a routable IP address) and so I must *configure ppp encap on the serial ?? * *I am a bit confused, thx for your help !! * * This E-mail is from O2. The E-mail and any files transmitted with it are confidential and may also be privileged and intended solely for the use of the individual or entity to whom they are addressed. Any unauthorised direct or indirect dissemination, distribution or copying of this message and any attachments is strictly prohibited. If you have received the E-mail in error please notify [EMAIL PROTECTED] or telephone ++ 353 1 6095000. * Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=48910t=48894 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: ip unnumbered [7:48894]
Hi Chuck Could you explain the statement : Usually, you would number your ethernet port with a public number, and you would use an ip unnumbered off that publicly addressed interface. - Normally we number the port with private address I am not sure what you mean by public number here!!! Just a bit puzzled . Cheers Jas -Original Message- From: Chuck [mailto:[EMAIL PROTECTED]] Sent: Wednesday, 17 July 2002 2:15 a.m. To: [EMAIL PROTECTED] Subject: Re: ip unnumbered [7:48894] recall that the link between you and whomever is a two host network. if you were numbering, you would most likely use a /30. even when connecting to the internet, this link need not use public IP space. Your ISP is most likely using a static route to you, and you in turn are using a static route to them. them: ip route your public space out interface X You: ip route 0.0.0.0 0.0.0.0 interface Y this is a regular practice. IP unnumbered is even better, because then no one has to commit to or agree upon address, and no one has to waste public space. Usually, you would number your ethernet port with a public number, and you would use an ip unnumbered off that publicly addressed interface. HTH richard dumoulin wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Hey guys, I have to connect a Cisco router to the internet (Worldcom) and I was told the following If your router is a CISCO model, then there is no need to assign actual IP addresses to the WAN serial interfaces since CISCO's un-numbered technology can be employed. Does this mean that I can configure IP unnumbered ethernet0 or loopback0 (with one of them having a routable IP address) and so I must configure ppp encap on the serial ?? I am a bit confused, thx for your help !! Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=48958t=48894 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: IP unnumbered and CBAC [7:48721]
From the config I see, here's what I'm interpreting: Router instructed to start monitoring packets coming in s0.1 as defined in the CBAC statement corp. Then there's an ACL 100 on the e0/0, going in the router, but if that's for CBAC, then it's on the wrong interface. CBAC needs an ACL to block traffic before it can monitor traffic and allow it to pass back out. So if you want to monitor the traffic going back out with CBAC, you'd need an ACL on the s0.1 out. So I'd permit the inside networks to go out, and block all other traffic, and then CBAC will let the traffic that came in s0.1 to go back out. Dennis Cooper wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... service timestamps debug datetime msec localtime show-timezone service timestamps log datetime msec localtime show-timezone service password-encryption ! hostname firewall ! boot system flash c3620-io-mz.120-3.T3.bin logging buffered 10 debugging enable secret 5 $1$hqZ4$k9Mvt5yfvbpipYmFGbTSS/ ! username Brisbane password 7 x username Adelaide password 7 username Perth password 7 xxx clock timezone EST 10 ip subnet-zero ip host Perth 125.1.100.24 ip domain-name corp.com.au ip name-server 125.1.10.3 ! ip inspect name corp tcp ip inspect name corp udp ip inspect name corp http ip inspect name corp ftp ip inspect name corp smtp frame-relay de-list 1 protocol ip frame-relay switching isdn switch-type basic-net3 ! ! ! interface BRI0/0 description 64K ISDN On-Ramp Backup Service to Brisbane Adelaide no ip address no ip directed-broadcast encapsulation ppp dialer pool-member 1 isdn switch-type basic-net3 ppp authentication chap ! interface Ethernet0/0 description Sydney Local Ethernet Segment ip address 172.25.201.1 255.255.0.0 no ip directed-broadcast no keepalive ! interface Ethernet1/0 desc Sydney untrusted segment ip address 192.168.3.3 255.255.255.0 ip access-group 100 in no ip directed-broadcast ! interface Serial1/0 description 192K CIR - 576K ACCESS to Perth mtu 800 no ip address no ip directed-broadcast encapsulation frame-relay no ip mroute-cache priority-group 1 frame-relay lmi-type ansi frame-relay route 16 interface Serial1/1 16 frame-relay route 20 interface Serial1/1 20 frame-relay route 22 interface Serial1/1 22 ! interface Serial1/0.1 point-to-point description 192K CIR PVC to Perth mtu 800 bandwidth 192 ip unnumbered Ethernet0/0 ip inspect corp in no ip directed-broadcast backup delay 5 10 backup interface Dialer0 frame-relay de-group 1 17 frame-relay interface-dlci 17 frame-relay payload-compression packet-by-packet ! interface Serial1/0.2 point-to-point description 16K PVC to Adelaide mtu 800 ip unnumbered Ethernet0/0 no ip directed-broadcast backup delay 5 10 backup interface Dialer1 frame-relay de-group 1 21 frame-relay interface-dlci 21 frame-relay payload-compression packet-by-packet ! interface Serial1/0.3 point-to-point description 16K PVC to Brisbane mtu 800 ip unnumbered Ethernet0/0 no ip directed-broadcast backup delay 5 10 backup interface Dialer2 frame-relay de-group 1 23 frame-relay interface-dlci 23 frame-relay payload-compression packet-by-packet ! interface Serial1/1 description Frame Relay Voice Service to Micom Marathon mtu 800 no ip address no ip directed-broadcast encapsulation frame-relay shutdown clockrate 50 frame-relay lmi-type ansi frame-relay intf-type dce frame-relay route 16 interface Serial1/0 16 frame-relay route 20 interface Serial1/0 20 frame-relay route 22 interface Serial1/0 22 ! interface Dialer0 description 64K ISDN Backup Service to Perth ip unnumbered Ethernet0/0 no ip directed-broadcast encapsulation ppp dialer remote-name Perth dialer pool 1 dialer-group 1 ppp authentication chap ! interface Dialer1 description 64K ISDN Backup Service to Adelaide ip unnumbered Ethernet0/0 no ip directed-broadcast encapsulation ppp dialer remote-name Adelaide dialer string X dialer pool 1 dialer-group 1 ppp authentication chap ! interface Dialer2 description 64K ISDN Backup Service to Brisbane ip unnumbered Ethernet0/0 no ip directed-broadcast encapsulation ppp dialer remote-name Brisbane dialer string dialer pool 1 dialer-group 1 ppp authentication chap ! router eigrp 69 redistribute static route-map static2eigrp network 172.25.0.0 network 192.168.3.0 default-metric 1000 1000 254 1 1500 no auto-summary ! ip classless ip route 0.0.0.0 0.0.0.0 125.1.100.24 ip route 172.16.10.0 255.255.255.0 192.168.3.1 ip route 172.16.15.0 255.255.255.0 192.168.3.1 ip route 172.16.20.0 255.255.255.0 192.168.3.1 ip route 192.168.4.0 255.255.255.0 192.168.3.1 ip route 192.168.7.0 255.255.255.0 192.168.3.1 ip route 192.168.10.0 255.255.255.0 192.168.3.1 ip route 192.168.52.0 255.255.255.0 172.25.201.3 ip
Re: IP unnumbered and CBAC [7:48721]
Hi Steve Here is an extract from the config - access-list 100 controls traffic from the untrusted section of the company being migrated. firewall is the name of the ip inspect policy interface Ethernet0/0 description Sydney Local Ethernet Segment ip address 172.25.201.1 255.255.0.0 no keepalive ! interface Ethernet1/0 ip address 192.168.3.3 255.255.255.0 ip access-group 100 in ! interface Serial1/0 description 192K CIR - 576K ACCESS to Head Office mtu 800 no ip address encapsulation frame-relay no ip mroute-cache priority-group 1 frame-relay lmi-type ansi frame-relay route 16 interface Serial1/1 16 frame-relay route 20 interface Serial1/1 20 frame-relay route 22 interface Serial1/1 22 ! interface Serial1/0.1 point-to-point description 192K CIR PVC to Head Office mtu 800 backup delay 5 10 backup interface Dialer0 ip unnumbered Ethernet0/0 ip inspect firewall in bandwidth 192 frame-relay de-group 1 17 frame-relay interface-dlci 17 frame-relay payload-compression packet-by-packet Steven A. Ridder wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... show me the configs Dennis Cooper wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Hi guys The scenario is two customer networks merging in the same building and we have a Cisco 3620 in between the two LAN networks. (E0/0 and E1/0) S0/0 ---3620---E0/0 172.25.0.0/16 ---E1/0192.168.3.0 There is a Frame Relay service to head office on interface Serial 0/0 and is currently ip unnmbered to the E0/0 interface. Using CBAC I cannot get the ip inspect stuff to work and I suspect either 1. the code 12.0(3)T FFS 2. IP unnumbered Q. Any one done this before? Regards Dennis Cooper Lab date 13/08/2002 (but who's counting) Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=48796t=48721 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: IP unnumbered and CBAC [7:48721]
not enough info to tell Need more of the config. Dennis Cooper wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Hi Steve Here is an extract from the config - access-list 100 controls traffic from the untrusted section of the company being migrated. firewall is the name of the ip inspect policy interface Ethernet0/0 description Sydney Local Ethernet Segment ip address 172.25.201.1 255.255.0.0 no keepalive ! interface Ethernet1/0 ip address 192.168.3.3 255.255.255.0 ip access-group 100 in ! interface Serial1/0 description 192K CIR - 576K ACCESS to Head Office mtu 800 no ip address encapsulation frame-relay no ip mroute-cache priority-group 1 frame-relay lmi-type ansi frame-relay route 16 interface Serial1/1 16 frame-relay route 20 interface Serial1/1 20 frame-relay route 22 interface Serial1/1 22 ! interface Serial1/0.1 point-to-point description 192K CIR PVC to Head Office mtu 800 backup delay 5 10 backup interface Dialer0 ip unnumbered Ethernet0/0 ip inspect firewall in bandwidth 192 frame-relay de-group 1 17 frame-relay interface-dlci 17 frame-relay payload-compression packet-by-packet Steven A. Ridder wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... show me the configs Dennis Cooper wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Hi guys The scenario is two customer networks merging in the same building and we have a Cisco 3620 in between the two LAN networks. (E0/0 and E1/0) S0/0 ---3620---E0/0 172.25.0.0/16 ---E1/0192.168.3.0 There is a Frame Relay service to head office on interface Serial 0/0 and is currently ip unnmbered to the E0/0 interface. Using CBAC I cannot get the ip inspect stuff to work and I suspect either 1. the code 12.0(3)T FFS 2. IP unnumbered Q. Any one done this before? Regards Dennis Cooper Lab date 13/08/2002 (but who's counting) Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=48797t=48721 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: IP unnumbered and CBAC [7:48721]
service timestamps debug datetime msec localtime show-timezone service timestamps log datetime msec localtime show-timezone service password-encryption ! hostname firewall ! boot system flash c3620-io-mz.120-3.T3.bin logging buffered 10 debugging enable secret 5 $1$hqZ4$k9Mvt5yfvbpipYmFGbTSS/ ! username Brisbane password 7 x username Adelaide password 7 username Perth password 7 xxx clock timezone EST 10 ip subnet-zero ip host Perth 125.1.100.24 ip domain-name corp.com.au ip name-server 125.1.10.3 ! ip inspect name corp tcp ip inspect name corp udp ip inspect name corp http ip inspect name corp ftp ip inspect name corp smtp frame-relay de-list 1 protocol ip frame-relay switching isdn switch-type basic-net3 ! ! ! interface BRI0/0 description 64K ISDN On-Ramp Backup Service to Brisbane Adelaide no ip address no ip directed-broadcast encapsulation ppp dialer pool-member 1 isdn switch-type basic-net3 ppp authentication chap ! interface Ethernet0/0 description Sydney Local Ethernet Segment ip address 172.25.201.1 255.255.0.0 no ip directed-broadcast no keepalive ! interface Ethernet1/0 desc Sydney untrusted segment ip address 192.168.3.3 255.255.255.0 ip access-group 100 in no ip directed-broadcast ! interface Serial1/0 description 192K CIR - 576K ACCESS to Perth mtu 800 no ip address no ip directed-broadcast encapsulation frame-relay no ip mroute-cache priority-group 1 frame-relay lmi-type ansi frame-relay route 16 interface Serial1/1 16 frame-relay route 20 interface Serial1/1 20 frame-relay route 22 interface Serial1/1 22 ! interface Serial1/0.1 point-to-point description 192K CIR PVC to Perth mtu 800 bandwidth 192 ip unnumbered Ethernet0/0 ip inspect corp in no ip directed-broadcast backup delay 5 10 backup interface Dialer0 frame-relay de-group 1 17 frame-relay interface-dlci 17 frame-relay payload-compression packet-by-packet ! interface Serial1/0.2 point-to-point description 16K PVC to Adelaide mtu 800 ip unnumbered Ethernet0/0 no ip directed-broadcast backup delay 5 10 backup interface Dialer1 frame-relay de-group 1 21 frame-relay interface-dlci 21 frame-relay payload-compression packet-by-packet ! interface Serial1/0.3 point-to-point description 16K PVC to Brisbane mtu 800 ip unnumbered Ethernet0/0 no ip directed-broadcast backup delay 5 10 backup interface Dialer2 frame-relay de-group 1 23 frame-relay interface-dlci 23 frame-relay payload-compression packet-by-packet ! interface Serial1/1 description Frame Relay Voice Service to Micom Marathon mtu 800 no ip address no ip directed-broadcast encapsulation frame-relay shutdown clockrate 50 frame-relay lmi-type ansi frame-relay intf-type dce frame-relay route 16 interface Serial1/0 16 frame-relay route 20 interface Serial1/0 20 frame-relay route 22 interface Serial1/0 22 ! interface Dialer0 description 64K ISDN Backup Service to Perth ip unnumbered Ethernet0/0 no ip directed-broadcast encapsulation ppp dialer remote-name Perth dialer pool 1 dialer-group 1 ppp authentication chap ! interface Dialer1 description 64K ISDN Backup Service to Adelaide ip unnumbered Ethernet0/0 no ip directed-broadcast encapsulation ppp dialer remote-name Adelaide dialer string X dialer pool 1 dialer-group 1 ppp authentication chap ! interface Dialer2 description 64K ISDN Backup Service to Brisbane ip unnumbered Ethernet0/0 no ip directed-broadcast encapsulation ppp dialer remote-name Brisbane dialer string dialer pool 1 dialer-group 1 ppp authentication chap ! router eigrp 69 redistribute static route-map static2eigrp network 172.25.0.0 network 192.168.3.0 default-metric 1000 1000 254 1 1500 no auto-summary ! ip classless ip route 0.0.0.0 0.0.0.0 125.1.100.24 ip route 172.16.10.0 255.255.255.0 192.168.3.1 ip route 172.16.15.0 255.255.255.0 192.168.3.1 ip route 172.16.20.0 255.255.255.0 192.168.3.1 ip route 192.168.4.0 255.255.255.0 192.168.3.1 ip route 192.168.7.0 255.255.255.0 192.168.3.1 ip route 192.168.10.0 255.255.255.0 192.168.3.1 ip route 192.168.52.0 255.255.255.0 172.25.201.3 ip route 192.168.144.0 255.255.255.0 192.168.3.1 no ip http server ! ! map-class frame-relay cir64k frame-relay traffic-rate 192000 50 frame-relay adaptive-shaping becn ! map-class frame-relay cir32k frame-relay traffic-rate 32000 4 frame-relay adaptive-shaping becn ! map-class frame-relay cir16k frame-relay traffic-rate 16000 24000 frame-relay adaptive-shaping becn access-list 1 permit 192.168.4.0 0.0.0.255 access-list 1 permit 192.168.7.0 0.0.0.255 access-list 1 permit 192.168.10.0 0.0.0.255 access-list 1 permit 192.168.144.0 0.0.0.255 access-list 1 permit 172.16.10.0 0.0.0.255 access-list 1 permit 172.16.15.0 0.0.0.255 access-list 1 permit 172.16.20.0 0.0.0.255 access-list 100 permit icmp any any access-list 100 permit ip 192.168.3.0 0.0.0.255 172.25.0.0 0.0.255.255 access-list 100 permit tcp any 203.19.170.0 0.0.0.31 eq 3389
Re: IP unnumbered and CBAC [7:48721]
show me the configs Dennis Cooper wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Hi guys The scenario is two customer networks merging in the same building and we have a Cisco 3620 in between the two LAN networks. (E0/0 and E1/0) S0/0 ---3620---E0/0 172.25.0.0/16 ---E1/0192.168.3.0 There is a Frame Relay service to head office on interface Serial 0/0 and is currently ip unnmbered to the E0/0 interface. Using CBAC I cannot get the ip inspect stuff to work and I suspect either 1. the code 12.0(3)T FFS 2. IP unnumbered Q. Any one done this before? Regards Dennis Cooper Lab date 13/08/2002 (but who's counting) Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=48723t=48721 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: ip unnumbered [7:34936]
Not sure what you're asking there? The address you're going to is within your Ethernet subnet. Traceroute shouldn't take too long (no hops). I take it you mean this is the remote router. I take it you made that config up (typos and all :-) ). Paste the real thing for both ends. What does traceroute report? Cheers, Gaz kaushalender wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Hi, I am facing a problem .That is i have use ip unnubered command on my router.But i am not able to traceroute my next hop but i am able to ping that next hop.Here is the conf int e0/0 ip address 216.252.243.181 255.255.255.240 full duplex ! ! int s0/0 ip address 192.168.5.2 255.255.255.252 encap ppp ! ! int s0/1 ip unnubered encap ppp ip route 0.0.0.0 0.0.0.0 s0/0 I am able to ping 216.252.243.182 but i am not able to traceroute 216.252.243.182 which is the next hop for me on int s0/1 plz tell me why this is happening thanx kaushalender Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=34950t=34936 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: IP unnumbered [7:21794]
Let's say you want to run frame relay or hdlc using serial interfaces on two routers, but don't have any ip addresses to waste, you can use the ip addresses of the ethernet or token ring interfaces as the ip addresses for your serial interfaces. This stuff is easy to look up on Cisco's web site. so check for configs there. A simple example would be something like: int s0 ip unnumbered e0 You are telling the router to use e0's address for the serial link. Now one would think that this would not work, because the ethernet interfaces on two routers usually will not have ip addresses in the same subnet (unless you are set them up on the same subnet in a practice lab). Somehow it all works, though. I need to play with it some more. I used ip unnumbered when I was trying to get ip ospf demand-circuit to work where the isdn link was a backup to a frame relay link. (Yes, this is apparently similar to a notorious ccbootcamp lab, but I didn't know that until I started noticing people posting to the lab list answers to questions I was having.) Thomas Larus birdy wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Dear all can anyone tell me what is IP unnumbered ? Regards, birdy Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=21849t=21794 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: IP unnumbered [7:21794]
You tie your serial (generally) to a LAN or loopback interface instead of giving the serial interface it's own address. For this scenerio just don't do it, need addresses, see RFC 1918. Dave birdy wrote: Dear all can anyone tell me what is IP unnumbered ? Regards, birdy -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=21853t=21794 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: IP unnumbered [7:21794]
I think a lot of the ISPs are doing this for the smaller customers.. For example, we put in on the side, an internet router for a small law firm using MCI and instead of giving us an address for the serial interface, they wanted me to ip unnumber it from ethernet port. Saves them some ip addresses for the serial link... but kinda screws it up for management purposes and then if you are running NAT, I think you might run into some problems there. But then again the customers really dont care as long as the few users can surf the net. Paul Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=21909t=21794 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP unnumbered [7:18250]
The Loopback Interface is useful in OSPF, BGP, for network management. If a loopback will have 2-3 uses anyway, why not throw in ip unnumbered. If someone is dead set against loopback, you could use interface serial 0/0 ip unnumbered interface ethernet 0/0 ip address 10.1.1.1 255.255.255.0 no keepalive The Ethernet interface would always be up!! ^-^-^-^-^-^-^-^-^-^-^ Bill Carter CCIE 5022 ^-^-^-^-^-^-^-^-^-^-^ -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Michael L. Williams Sent: Tuesday, September 04, 2001 5:49 PM To: [EMAIL PROTECTED] Subject: Re: IP unnumbered [7:18250] Dave, I agree totally with your statement, however, I don't understand why you say that if you use ip unnumbered pointing to a LoopBack interface that nullifies the point of using unnumbered (to save IPs). You can still use a single IP address on a LoopBack not waste more by putting separate IPs on each p-t-p link.. Mike W. MADMAN wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Brett gives a good example that will work just fine but I would not recommend using IP unnumbered. With RFC 1918 you have more IP addesses than your going to need so no problems with using registered addresses on p-to-p links. troubleshooting also becomes trickier but if you insist on using them then use a loopback interface, but then a primary argument is shot, burning IP addreses. Dave Brett Hairbottle wrote: Hi Instead of using a numbered link you can use ip unnumbered to connect sites. Example: Router A: interface fastethernet 0 ip address 10.100.2.1 255.255.255.0 interface serial 0 ip unnumbered fasthethernet 0 Router B: interface fastethernet 0 ip address 10.100.31 255.255.255.0 interface serial 0 ip unnumbered fasthethernet 0 now instead of assigning a ip address to each serial port you can use the ip unnumbered command Brett Hairbottle Network Administrator CCNA - Original Message - From: sami natour To: Sent: Sunday, September 02, 2001 10:33 PM Subject: IP unnumbered [7:18250] Hello everybody, I know how to cinfigure IP unumbered but I do not know any practical scenario that I make use of this feature.Any body has specific scanrios where I can use ip unnumbered . Regards , sami __ Do You Yahoo!? Get email alerts NEW webcam video instant messaging with Yahoo! Messenger http://im.yahoo.com -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=18604t=18250 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP unnumbered [7:18250]
In previous network monitoring experience, I have had it happen to me where a customer unplugs the lan to do some work, but leaves the serial in, thinking theyre doing us a favor. Brian Sonic Whalen Success = Preparation + Opportunity On Wed, 5 Sep 2001, Bill Carter wrote: The Loopback Interface is useful in OSPF, BGP, for network management. If a loopback will have 2-3 uses anyway, why not throw in ip unnumbered. If someone is dead set against loopback, you could use interface serial 0/0 ip unnumbered interface ethernet 0/0 ip address 10.1.1.1 255.255.255.0 no keepalive The Ethernet interface would always be up!! ^-^-^-^-^-^-^-^-^-^-^ Bill Carter CCIE 5022 ^-^-^-^-^-^-^-^-^-^-^ -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Michael L. Williams Sent: Tuesday, September 04, 2001 5:49 PM To: [EMAIL PROTECTED] Subject: Re: IP unnumbered [7:18250] Dave, I agree totally with your statement, however, I don't understand why you say that if you use ip unnumbered pointing to a LoopBack interface that nullifies the point of using unnumbered (to save IPs). You can still use a single IP address on a LoopBack not waste more by putting separate IPs on each p-t-p link.. Mike W. MADMAN wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Brett gives a good example that will work just fine but I would not recommend using IP unnumbered. With RFC 1918 you have more IP addesses than your going to need so no problems with using registered addresses on p-to-p links. troubleshooting also becomes trickier but if you insist on using them then use a loopback interface, but then a primary argument is shot, burning IP addreses. Dave Brett Hairbottle wrote: Hi Instead of using a numbered link you can use ip unnumbered to connect sites. Example: Router A: interface fastethernet 0 ip address 10.100.2.1 255.255.255.0 interface serial 0 ip unnumbered fasthethernet 0 Router B: interface fastethernet 0 ip address 10.100.31 255.255.255.0 interface serial 0 ip unnumbered fasthethernet 0 now instead of assigning a ip address to each serial port you can use the ip unnumbered command Brett Hairbottle Network Administrator CCNA - Original Message - From: sami natour To: Sent: Sunday, September 02, 2001 10:33 PM Subject: IP unnumbered [7:18250] Hello everybody, I know how to cinfigure IP unumbered but I do not know any practical scenario that I make use of this feature.Any body has specific scanrios where I can use ip unnumbered . Regards , sami __ Do You Yahoo!? Get email alerts NEW webcam video instant messaging with Yahoo! Messenger http://im.yahoo.com -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=18658t=18250 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: IP unnumbered [7:18250]
Hi Instead of using a numbered link you can use ip unnumbered to connect sites. Example: Router A: interface fastethernet 0 ip address 10.100.2.1 255.255.255.0 interface serial 0 ip unnumbered fasthethernet 0 Router B: interface fastethernet 0 ip address 10.100.31 255.255.255.0 interface serial 0 ip unnumbered fasthethernet 0 now instead of assigning a ip address to each serial port you can use the ip unnumbered command Brett Hairbottle Network Administrator CCNA - Original Message - From: sami natour To: Sent: Sunday, September 02, 2001 10:33 PM Subject: IP unnumbered [7:18250] Hello everybody, I know how to cinfigure IP unumbered but I do not know any practical scenario that I make use of this feature.Any body has specific scanrios where I can use ip unnumbered . Regards , sami __ Do You Yahoo!? Get email alerts NEW webcam video instant messaging with Yahoo! Messenger http://im.yahoo.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=18465t=18250 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: IP unnumbered [7:18250]
Brett gives a good example that will work just fine but I would not recommend using IP unnumbered. With RFC 1918 you have more IP addesses than your going to need so no problems with using registered addresses on p-to-p links. troubleshooting also becomes trickier but if you insist on using them then use a loopback interface, but then a primary argument is shot, burning IP addreses. Dave Brett Hairbottle wrote: Hi Instead of using a numbered link you can use ip unnumbered to connect sites. Example: Router A: interface fastethernet 0 ip address 10.100.2.1 255.255.255.0 interface serial 0 ip unnumbered fasthethernet 0 Router B: interface fastethernet 0 ip address 10.100.31 255.255.255.0 interface serial 0 ip unnumbered fasthethernet 0 now instead of assigning a ip address to each serial port you can use the ip unnumbered command Brett Hairbottle Network Administrator CCNA - Original Message - From: sami natour To: Sent: Sunday, September 02, 2001 10:33 PM Subject: IP unnumbered [7:18250] Hello everybody, I know how to cinfigure IP unumbered but I do not know any practical scenario that I make use of this feature.Any body has specific scanrios where I can use ip unnumbered . Regards , sami __ Do You Yahoo!? Get email alerts NEW webcam video instant messaging with Yahoo! Messenger http://im.yahoo.com -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=18475t=18250 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: IP unnumbered [7:18250]
Dave, I agree totally with your statement, however, I don't understand why you say that if you use ip unnumbered pointing to a LoopBack interface that nullifies the point of using unnumbered (to save IPs). You can still use a single IP address on a LoopBack not waste more by putting separate IPs on each p-t-p link.. Mike W. MADMAN wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Brett gives a good example that will work just fine but I would not recommend using IP unnumbered. With RFC 1918 you have more IP addesses than your going to need so no problems with using registered addresses on p-to-p links. troubleshooting also becomes trickier but if you insist on using them then use a loopback interface, but then a primary argument is shot, burning IP addreses. Dave Brett Hairbottle wrote: Hi Instead of using a numbered link you can use ip unnumbered to connect sites. Example: Router A: interface fastethernet 0 ip address 10.100.2.1 255.255.255.0 interface serial 0 ip unnumbered fasthethernet 0 Router B: interface fastethernet 0 ip address 10.100.31 255.255.255.0 interface serial 0 ip unnumbered fasthethernet 0 now instead of assigning a ip address to each serial port you can use the ip unnumbered command Brett Hairbottle Network Administrator CCNA - Original Message - From: sami natour To: Sent: Sunday, September 02, 2001 10:33 PM Subject: IP unnumbered [7:18250] Hello everybody, I know how to cinfigure IP unumbered but I do not know any practical scenario that I make use of this feature.Any body has specific scanrios where I can use ip unnumbered . Regards , sami __ Do You Yahoo!? Get email alerts NEW webcam video instant messaging with Yahoo! Messenger http://im.yahoo.com -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=18510t=18250 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: IP unnumbered [7:18250]
At this point, it think it would be good to mention that (IMHO) it's best to use the LoopBack interface for ip unnumbered because it can never go down.. In the config snipet you gave, your Serial0 couldn't communicate if FastEthernet0 went down. I do believe that with some version of 12.x, however, Cisco has made it so that even if the interface goes down, the unnumbered interface can still use it's IP, so be sure to check your IOS version, and see if that's the case.. But, that's just another good reason to use LoopBack because then you don't have to worry about that.. =) Mike W. Brett Hairbottle wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Hi Instead of using a numbered link you can use ip unnumbered to connect sites. Example: Router A: interface fastethernet 0 ip address 10.100.2.1 255.255.255.0 interface serial 0 ip unnumbered fasthethernet 0 Router B: interface fastethernet 0 ip address 10.100.31 255.255.255.0 interface serial 0 ip unnumbered fasthethernet 0 now instead of assigning a ip address to each serial port you can use the ip unnumbered command Brett Hairbottle Network Administrator CCNA - Original Message - From: sami natour To: Sent: Sunday, September 02, 2001 10:33 PM Subject: IP unnumbered [7:18250] Hello everybody, I know how to cinfigure IP unumbered but I do not know any practical scenario that I make use of this feature.Any body has specific scanrios where I can use ip unnumbered . Regards , sami __ Do You Yahoo!? Get email alerts NEW webcam video instant messaging with Yahoo! Messenger http://im.yahoo.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=18509t=18250 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: IP unnumbered [7:18250]
Agree, you don't use as many address with LB's as p-to-p networks but the primary point I was trying to make before I rambled is that there is really no good reason IMHO to ip unnumbered. Dave Michael L. Williams wrote: Dave, I agree totally with your statement, however, I don't understand why you say that if you use ip unnumbered pointing to a LoopBack interface that nullifies the point of using unnumbered (to save IPs). You can still use a single IP address on a LoopBack not waste more by putting separate IPs on each p-t-p link.. Mike W. MADMAN wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Brett gives a good example that will work just fine but I would not recommend using IP unnumbered. With RFC 1918 you have more IP addesses than your going to need so no problems with using registered addresses on p-to-p links. troubleshooting also becomes trickier but if you insist on using them then use a loopback interface, but then a primary argument is shot, burning IP addreses. Dave Brett Hairbottle wrote: Hi Instead of using a numbered link you can use ip unnumbered to connect sites. Example: Router A: interface fastethernet 0 ip address 10.100.2.1 255.255.255.0 interface serial 0 ip unnumbered fasthethernet 0 Router B: interface fastethernet 0 ip address 10.100.31 255.255.255.0 interface serial 0 ip unnumbered fasthethernet 0 now instead of assigning a ip address to each serial port you can use the ip unnumbered command Brett Hairbottle Network Administrator CCNA - Original Message - From: sami natour To: Sent: Sunday, September 02, 2001 10:33 PM Subject: IP unnumbered [7:18250] Hello everybody, I know how to cinfigure IP unumbered but I do not know any practical scenario that I make use of this feature.Any body has specific scanrios where I can use ip unnumbered . Regards , sami __ Do You Yahoo!? Get email alerts NEW webcam video instant messaging with Yahoo! Messenger http://im.yahoo.com -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=18514t=18250 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP unnumbered [7:18250]
Sure, IP unnumbered is frequently used by ISP's to save address space and for ease of configuration. Lets say you have a 7513 with 280 T1 customers on it, that would mean wasting 280 /30 IP blocks just on interface transit, so why use those IP's if you don't have a specific reason to? That is one of the bigger applications. You can also use it if you have only one IP address routed to you and you want to use it for NAT. You can use IP unnumbered on the serial, assign the ethernet a private IP, use the public for the NAT pool and map port 23 on the public IP address to port 23 on the private ethernet IP for telnet access. Hope this is what you were looking for. Guy -Original Message- From: sami natour To: [EMAIL PROTECTED] Sent: 9/2/01 4:33 PM Subject: IP unnumbered [7:18250] Hello everybody, I know how to cinfigure IP unumbered but I do not know any practical scenario that I make use of this feature.Any body has specific scanrios where I can use ip unnumbered . Regards , sami __ Do You Yahoo!? Get email alerts NEW webcam video instant messaging with Yahoo! Messenger http://im.yahoo.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=18255t=18250 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: IP unnumbered [7:18250]
When IP addresses are hard to come by (remember: a /30 subnet takes 4 addresses). When you don't want to deal with administering tons of /30 subnets that would comprise the WAN links. There are probably other reasons. These were the first to come to mind. Ken Diliberto CCNA, CCNP, Ericsson E1 E2, CCIE Pre-written NRA Life Member, American Airlines Advantage Gold Co-Author Investigating Computer Crime ;-) I'd say I'm sorry, but I couldn't resist getting in on the fun. :-) sami natour 09/02/01 03:33PM Hello everybody, I know how to cinfigure IP unumbered but I do not know any practical scenario that I make use of this feature.Any body has specific scanrios where I can use ip unnumbered . Regards , sami [snip] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=18257t=18250 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: IP unnumbered [7:18250]
you might use it if you had say an access-server e.g you got group-async 1 and group-async the router wont let you do 'ip address 10.0.0.1 255.0.0.0 on both interfaces so instead you would assign 10.0.0.1 to loopback 0 and then in group-async 1 2 ip unnumbered loopback 0 thus giving them both the same ip :) Justin At 04:33 PM 2/09/01 -0400, you wrote: Hello everybody, I know how to cinfigure IP unumbered but I do not know any practical scenario that I make use of this feature.Any body has specific scanrios where I can use ip unnumbered . Regards , sami __ Do You Yahoo!? Get email alerts NEW webcam video instant messaging with Yahoo! Messenger http://im.yahoo.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=18260t=18250 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP unnumbered [7:18250]
Another advantage of IP unumbered, is if you have say 250 T1 customers hanging off a router, and you default router them out there serial interface: ip route 0.0.0.0 0.0.0.0 s0 then, if you ever want to move customers to another router, you don't have to have access to there router to do anything, nd don't have to go renumbering any interfaces either. Brian On Sun, 2 Sep 2001, Lupi, Guy wrote: Sure, IP unnumbered is frequently used by ISP's to save address space and for ease of configuration. Lets say you have a 7513 with 280 T1 customers on it, that would mean wasting 280 /30 IP blocks just on interface transit, so why use those IP's if you don't have a specific reason to? That is one of the bigger applications. You can also use it if you have only one IP address routed to you and you want to use it for NAT. You can use IP unnumbered on the serial, assign the ethernet a private IP, use the public for the NAT pool and map port 23 on the public IP address to port 23 on the private ethernet IP for telnet access. Hope this is what you were looking for. Guy -Original Message- From: sami natour To: [EMAIL PROTECTED] Sent: 9/2/01 4:33 PM Subject: IP unnumbered [7:18250] Hello everybody, I know how to cinfigure IP unumbered but I do not know any practical scenario that I make use of this feature.Any body has specific scanrios where I can use ip unnumbered . Regards , sami __ Do You Yahoo!? Get email alerts NEW webcam video instant messaging with Yahoo! Messenger http://im.yahoo.com I'm buying / selling used CISCO gear!! email me for a quote Brian Feeny, CCIE #8036 Netjam, LLC [EMAIL PROTECTED] http://www.netjam.net VISA/MC/AMEX/COD phone: 318-212-0245 30 day warranty fax: 318-212-0246 Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=18261t=18250 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP unnumbered
You lose the ability to troubleshoot if link goes down. Cannot ping because there is no IP address to ping. Heather Buri csc Technology Services - Houston Phone: (713)-961-8592 Fax:(713)-961-8249 Mobile: Alpha Page: Mailing:1360 Post Oak Blvd Suite 500 Houston, TX 77056 -Original Message- From: Nabil Fares [mailto:[EMAIL PROTECTED]] Sent: Monday, March 19, 2001 11:41 AM To: [EMAIL PROTECTED] Subject: IP unnumbered Greetings all, Can you guys share any disadvantages to ip unnumbered. Thanks, Nabil _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP unnumbered
To elaborate on this, if via monitoring you notice pings start to fail, you do not know if the problem is with the serial or lan interface. i have seen a few of these where customers lan maintenance caused wan failure. Bri On Mon, 19 Mar 2001, Buri, Heather H wrote: You lose the ability to troubleshoot if link goes down. Cannot ping because there is no IP address to ping. Heather Buri csc Technology Services - Houston Phone:(713)-961-8592 Fax: (713)-961-8249 Mobile: Alpha Page: Mailing: 1360 Post Oak Blvd Suite 500 Houston, TX 77056 -Original Message- From: Nabil Fares [mailto:[EMAIL PROTECTED]] Sent: Monday, March 19, 2001 11:41 AM To: [EMAIL PROTECTED] Subject: IP unnumbered Greetings all, Can you guys share any disadvantages to ip unnumbered. Thanks, Nabil _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: IP unnumbered and OSPF
Karl, Tom, I think you are both mistaken--in fact, RFC 2328 contains multiple references to unnumbered point-to-point links and what should be done about them when developing an OSPF implementation. The router doesn't need an exact interface IP address on a point-to-point link in order to form a neighbor relationship. All OSPF packets on a point-to-point link are going to be sent to the multicast address 224.0.0.5, and it really doesn't matter what IP address is the source in those packets. The neighboring router is identified by its router ID, not its address on the interface. I have set up OSPF with IP unnumbered, and it worked just fine. Pamela At 02:07 AM 2/1/01 -0500, Tom Pruneau wrote: Greetings Karl I can't remember exactly where I read that , but I did. More specifically you can't have ip unnumbered on an interface running OSPF because there is no address to be neighbors with. If what you want to do is have a router with some ospf interfaces and some other interface not running ospf, and you want unnumbered on the non-OSPF interfaces, I think taht would be OK. Tom At 03:22 PM 01/31/2001 -0500, Karl R. West wrote: Refresh me please... I remember reading some where why you should not have IP UNNUMBERED running on the router your going to put OSPF on. Can some one refresh my memory. Regards, Karl _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP unnumbered and OSPF
Thanks Pamela, I found the same info after a bit of searching on the Cisco site. But I know I read it somewhere, maybe I wasn't paying attention to what I was reading. Karl -Original Message- From: Montgomery, Robert WARCOM Contractor [mailto:[EMAIL PROTECTED]] Sent: Thursday, February 01, 2001 3:45 PM To: Pamela Forsyth; [EMAIL PROTECTED]; [EMAIL PROTECTED] Subject: RE: IP unnumbered and OSPF From the Cisco Press book: "When an unnumbered interface is configured, it references another interface ... When enabling OSPF on the unnumbered int with the network command, use an 'address wildcard-mask' pair that refers to the interface to which the unnumbered interface is pointing." -Original Message- From: Pamela Forsyth [mailto:[EMAIL PROTECTED]] Sent: Thursday, February 01, 2001 1:07 PM To: [EMAIL PROTECTED] Subject: Re: IP unnumbered and OSPF Karl, Tom, I think you are both mistaken--in fact, RFC 2328 contains multiple references to unnumbered point-to-point links and what should be done about them when developing an OSPF implementation. The router doesn't need an exact interface IP address on a point-to-point link in order to form a neighbor relationship. All OSPF packets on a point-to-point link are going to be sent to the multicast address 224.0.0.5, and it really doesn't matter what IP address is the source in those packets. The neighboring router is identified by its router ID, not its address on the interface. I have set up OSPF with IP unnumbered, and it worked just fine. Pamela At 02:07 AM 2/1/01 -0500, Tom Pruneau wrote: Greetings Karl I can't remember exactly where I read that , but I did. More specifically you can't have ip unnumbered on an interface running OSPF because there is no address to be neighbors with. If what you want to do is have a router with some ospf interfaces and some other interface not running ospf, and you want unnumbered on the non-OSPF interfaces, I think taht would be OK. Tom At 03:22 PM 01/31/2001 -0500, Karl R. West wrote: Refresh me please... I remember reading some where why you should not have IP UNNUMBERED running on the router your going to put OSPF on. Can some one refresh my memory. Regards, Karl _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP unnumbered and OSPF
I guess you could do that too... -Original Message- From: Montgomery, Robert WARCOM Contractor [mailto:[EMAIL PROTECTED]] Sent: Thursday, February 01, 2001 2:36 PM To: Karl R. West; [EMAIL PROTECTED] Subject: RE: IP unnumbered and OSPF Why wouldn't you just use wildcards to indicated the exact interface(s)? -Original Message- From: Karl R. West [mailto:[EMAIL PROTECTED]] Sent: Thursday, February 01, 2001 11:23 AM To: 'Tom Pruneau'; [EMAIL PROTECTED] Subject: RE: IP unnumbered and OSPF Thanks, I thought so too but someone pointed me to this link http://www.cisco.com/warp/public/104/ospfdb1.html -Original Message- From: Tom Pruneau [mailto:[EMAIL PROTECTED]] Sent: Thursday, February 01, 2001 2:08 AM To: Karl R. West; [EMAIL PROTECTED] Subject: Re: IP unnumbered and OSPF Greetings Karl I can't remember exactly where I read that , but I did. More specifically you can't have ip unnumbered on an interface running OSPF because there is no address to be neighbors with. If what you want to do is have a router with some ospf interfaces and some other interface not running ospf, and you want unnumbered on the non-OSPF interfaces, I think taht would be OK. Tom At 03:22 PM 01/31/2001 -0500, Karl R. West wrote: Refresh me please... I remember reading some where why you should not have IP UNNUMBERED running on the router your going to put OSPF on. Can some one refresh my memory. Regards, Karl _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Tom Pruneau Trainer Network Operations GENUITY 3 Van de Graff Drive Burlington Ma. 01803 24 Hr. Network Operations Center 800-436-8489 If you need to get a hold of me my hours are 7AM-3PM ET Mon-Fri --- This email is composed of 82% post consumer recycled data bits --- "Once in a while you get shown the light in the strangest of places if you look at it right" _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: IP unnumbered and OSPF
Greetings Karl I can't remember exactly where I read that , but I did. More specifically you can't have ip unnumbered on an interface running OSPF because there is no address to be neighbors with. If what you want to do is have a router with some ospf interfaces and some other interface not running ospf, and you want unnumbered on the non-OSPF interfaces, I think taht would be OK. Tom At 03:22 PM 01/31/2001 -0500, Karl R. West wrote: Refresh me please... I remember reading some where why you should not have IP UNNUMBERED running on the router your going to put OSPF on. Can some one refresh my memory. Regards, Karl _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Tom Pruneau Trainer Network Operations GENUITY 3 Van de Graff Drive Burlington Ma. 01803 24 Hr. Network Operations Center 800-436-8489 If you need to get a hold of me my hours are 7AM-3PM ET Mon-Fri --- This email is composed of 82% post consumer recycled data bits --- "Once in a while you get shown the light in the strangest of places if you look at it right" _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP unnumbered and OSPF
Thanks, I thought so too but someone pointed me to this link http://www.cisco.com/warp/public/104/ospfdb1.html -Original Message- From: Tom Pruneau [mailto:[EMAIL PROTECTED]] Sent: Thursday, February 01, 2001 2:08 AM To: Karl R. West; [EMAIL PROTECTED] Subject: Re: IP unnumbered and OSPF Greetings Karl I can't remember exactly where I read that , but I did. More specifically you can't have ip unnumbered on an interface running OSPF because there is no address to be neighbors with. If what you want to do is have a router with some ospf interfaces and some other interface not running ospf, and you want unnumbered on the non-OSPF interfaces, I think taht would be OK. Tom At 03:22 PM 01/31/2001 -0500, Karl R. West wrote: Refresh me please... I remember reading some where why you should not have IP UNNUMBERED running on the router your going to put OSPF on. Can some one refresh my memory. Regards, Karl _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Tom Pruneau Trainer Network Operations GENUITY 3 Van de Graff Drive Burlington Ma. 01803 24 Hr. Network Operations Center 800-436-8489 If you need to get a hold of me my hours are 7AM-3PM ET Mon-Fri --- This email is composed of 82% post consumer recycled data bits --- "Once in a while you get shown the light in the strangest of places if you look at it right" _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP unnumbered and OSPF
Why wouldn't you just use wildcards to indicated the exact interface(s)? -Original Message- From: Karl R. West [mailto:[EMAIL PROTECTED]] Sent: Thursday, February 01, 2001 11:23 AM To: 'Tom Pruneau'; [EMAIL PROTECTED] Subject: RE: IP unnumbered and OSPF Thanks, I thought so too but someone pointed me to this link http://www.cisco.com/warp/public/104/ospfdb1.html -Original Message- From: Tom Pruneau [mailto:[EMAIL PROTECTED]] Sent: Thursday, February 01, 2001 2:08 AM To: Karl R. West; [EMAIL PROTECTED] Subject: Re: IP unnumbered and OSPF Greetings Karl I can't remember exactly where I read that , but I did. More specifically you can't have ip unnumbered on an interface running OSPF because there is no address to be neighbors with. If what you want to do is have a router with some ospf interfaces and some other interface not running ospf, and you want unnumbered on the non-OSPF interfaces, I think taht would be OK. Tom At 03:22 PM 01/31/2001 -0500, Karl R. West wrote: Refresh me please... I remember reading some where why you should not have IP UNNUMBERED running on the router your going to put OSPF on. Can some one refresh my memory. Regards, Karl _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Tom Pruneau Trainer Network Operations GENUITY 3 Van de Graff Drive Burlington Ma. 01803 24 Hr. Network Operations Center 800-436-8489 If you need to get a hold of me my hours are 7AM-3PM ET Mon-Fri --- This email is composed of 82% post consumer recycled data bits --- "Once in a while you get shown the light in the strangest of places if you look at it right" _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP unnumbered and OSPF
From the Cisco Press book: "When an unnumbered interface is configured, it references another interface ... When enabling OSPF on the unnumbered int with the network command, use an 'address wildcard-mask' pair that refers to the interface to which the unnumbered interface is pointing." -Original Message- From: Pamela Forsyth [mailto:[EMAIL PROTECTED]] Sent: Thursday, February 01, 2001 1:07 PM To: [EMAIL PROTECTED] Subject: Re: IP unnumbered and OSPF Karl, Tom, I think you are both mistaken--in fact, RFC 2328 contains multiple references to unnumbered point-to-point links and what should be done about them when developing an OSPF implementation. The router doesn't need an exact interface IP address on a point-to-point link in order to form a neighbor relationship. All OSPF packets on a point-to-point link are going to be sent to the multicast address 224.0.0.5, and it really doesn't matter what IP address is the source in those packets. The neighboring router is identified by its router ID, not its address on the interface. I have set up OSPF with IP unnumbered, and it worked just fine. Pamela At 02:07 AM 2/1/01 -0500, Tom Pruneau wrote: Greetings Karl I can't remember exactly where I read that , but I did. More specifically you can't have ip unnumbered on an interface running OSPF because there is no address to be neighbors with. If what you want to do is have a router with some ospf interfaces and some other interface not running ospf, and you want unnumbered on the non-OSPF interfaces, I think taht would be OK. Tom At 03:22 PM 01/31/2001 -0500, Karl R. West wrote: Refresh me please... I remember reading some where why you should not have IP UNNUMBERED running on the router your going to put OSPF on. Can some one refresh my memory. Regards, Karl _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: RE: IP unnumbered and OSPF
Ip unnumbered can be used on OSPF running routers.U can refer this with the cisco link http://www.cisco.com/warp/public/104/ospfdb1.html. Regards N.Anand - Original Message -- "Montgomery, Robert WARCOM Contractor" [EMAIL PROTECTED] wrote: To:Pamela Forsyth [EMAIL PROTECTED], [EMAIL PROTECTED], [EMAIL PROTECTED] From:"Montgomery, Robert WARCOM Contractor" [EMAIL PROTECTED] Date:Thu, 1 Feb 2001 12:45:04 -0800 Subject: RE: IP unnumbered and OSPF From the Cisco Press book: "When an unnumbered interface is configured, it references another interface ... When enabling OSPF on the unnumbered int with the network command, use an 'address wildcard-mask' pair that refers to the interface to which the unnumbered interface is pointing." -Original Message- From: Pamela Forsyth [mailto:[EMAIL PROTECTED]] Sent: Thursday, February 01, 2001 1:07 PM To: [EMAIL PROTECTED] Subject: Re: IP unnumbered and OSPF Karl, Tom, I think you are both mistaken--in fact, RFC 2328 contains multiple references to unnumbered point-to-point links and what should be done about them when developing an OSPF implementation. The router doesn't need an exact interface IP address on a point-to-point link in order to form a neighbor relationship. All OSPF packets on a point-to-point link are going to be sent to the multicast address 224.0.0.5, and it really doesn't matter what IP address is the source in those packets. The neighboring router is identified by its router ID, not its address on the interface. I have set up OSPF with IP unnumbered, and it worked just fine. Pamela At 02:07 AM 2/1/01 -0500, Tom Pruneau wrote: Greetings Karl I can't remember exactly where I read that , but I did. More specifically you can't have ip unnumbered on an interface running OSPF because there is no address to be neighbors with. If what you want to do is have a router with some ospf interfaces and some other interface not running ospf, and you want unnumbered on the non-OSPF interfaces, I think taht would be OK. Tom At 03:22 PM 01/31/2001 -0500, Karl R. West wrote: Refresh me please... I remember reading some where why you should not have IP UNNUMBERED running on the router your going to put OSPF on. Can some one refresh my memory. Regards, Karl _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ Chat with your friends as soon as they come online. Get Rediff Bol at http://bol.rediff.com _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: IP Unnumbered.
From my experience it is better to have unnumbered pointing to loopback as a backup or load balancing interface since it will be better for us to troubleshoot then Jason --- [EMAIL PROTECTED] wrote: Of course, you can always use a loopback address as the 'unnumbered' address, which gets around the problems of the ethernet availability. Obviously the loopback interface uses an address itself, but depending on whether you're using a loopback interface anyway, and how many unnumbered interfaces refer to it, unnumbered with a loopback can still save IP addresses. JMcL -- Forwarded by Jenny Mcleod/NSO/CSDA on 17/10/2000 11:23 am --- "Brian W." [EMAIL PROTECTED] on 17/10/2000 09:31:40 am Please respond to "Brian W." [EMAIL PROTECTED] To: Gunjan Mathur at 9netave [EMAIL PROTECTED] cc: [EMAIL PROTECTED] (bcc: JENNY MCLEOD/NSO/CSDA) Subject: Re: IP Unnumbered. There is one huge disadvantage. If the ether segment goes down in an ip unnumbered setup, then even if everything is physically ok on the serial link associated, that serial link will become unusable. From a monitoring perspective, unnumbered is a bad idea. I suspect some people use it to save ip space. Brian On Mon, 16 Oct 2000, Gunjan Mathur at 9netave wrote: Hi, Can somebody tell me Advantages disadvantages of IP unnumbered system. TIA Gm. _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] __ Do You Yahoo!? Yahoo! Messenger - Talk while you surf! It's FREE. http://im.yahoo.com/ _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: IP Unnumbered.
Advisable to use it over a point to point Links. Thangavel - Original Message - From: Brian [EMAIL PROTECTED] To: Erick B. [EMAIL PROTECTED] Cc: Gunjan Mathur at 9netave [EMAIL PROTECTED]; [EMAIL PROTECTED] Sent: Monday, October 16, 2000 5:41 PM Subject: Re: IP Unnumbered. unnumbered interfaces also present design problems when designing a scalable IGP. Brian On Mon, 16 Oct 2000, Erick B. wrote: Advantages: Saves on IP address space if you don't have networks to spare. Disadvantages: Harder to troubleshoot problems since you can't ping the unnumbered interface to see if it's down, etc. --- Gunjan Mathur at 9netave [EMAIL PROTECTED] wrote: Hi, Can somebody tell me Advantages disadvantages of IP unnumbered system. __ Do You Yahoo!? Yahoo! Messenger - Talk while you surf! It's FREE. http://im.yahoo.com/ _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] --- Brian Feeny, CCNP, CCDP [EMAIL PROTECTED] Network Administrator ShreveNet Inc. (ASN 11881) _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP Unnumbered.
I'm no expert, but I have played with it. We have a lab with an old 3000 token ring router, back-to-back with a 2500 ethernet router. The 3000 is running IOS 9.x and the 2500 is running 11.2. The 3000 is on a subnet with another router which is our link into the Campus Area Network. With ip unnumbered, we can not route properly from the ethernet to the CAN. When we put a bona fide subnet on the serial ports, we can route to the CAN. We haven't tried it with the 3000 on a higher level IOS, because it would have to boot from a tftp server, and we haven't taken the time to set it up. Ray M. -Original Message-From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of net974 at YahooSent: Monday, October 16, 2000 9:19 AMTo: [EMAIL PROTECTED]Subject: IP Unnumbered. Hi, Can somebody tell me Advantages disadvantages of IP unnumbered system. TIA Gm.
Re: IP Unnumbered.
Ip unnumbered preserves IP addresses. It allows a port to "borrow" an IP address from another Port on the same device. (usually the Loopback, can be any, but Loopback stays "up") It's great for point to point connections. ISDN , Frame Relay etc.. Jon
Re: IP Unnumbered.
Advantages: Saves on IP address space if you don't have networks to spare. Disadvantages: Harder to troubleshoot problems since you can't ping the unnumbered interface to see if it's down, etc. --- Gunjan Mathur at 9netave [EMAIL PROTECTED] wrote: Hi, Can somebody tell me Advantages disadvantages of IP unnumbered system. __ Do You Yahoo!? Yahoo! Messenger - Talk while you surf! It's FREE. http://im.yahoo.com/ _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP Unnumbered.
I'm going to say 2 AS's because no internet traffic can pass between the two groups, only private traffic. Therefore, the Internet will see these as discrete systems, and not a single AS. That is unless you are going to let internal internet traffic cross C D, but from your diagram I believe that is not the case. Anyone else? Original Message Follows From: "Ray Mosely" [EMAIL PROTECTED] Reply-To: "Ray Mosely" [EMAIL PROTECTED] To: "net974 at Yahoo" [EMAIL PROTECTED], [EMAIL PROTECTED] Subject: RE: IP Unnumbered. Date: Mon, 16 Oct 2000 10:21:55 -0500 I'm no expert, but I have played with it. We have a lab with an old 3000 token ring router, back-to-back with a 2500 ethernet router. The 3000 is running IOS 9.x and the 2500 is running 11.2. The 3000 is on a subnet with another router which is our link into the Campus Area Network. With ip unnumbered, we can not route properly from the ethernet to the CAN. When we put a bona fide subnet on the serial ports, we can route to the CAN. We haven't tried it with the 3000 on a higher level IOS, because it would have to boot from a tftp server, and we haven't taken the time to set it up. Ray M. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of net974 at Yahoo Sent: Monday, October 16, 2000 9:19 AM To: [EMAIL PROTECTED] Subject: IP Unnumbered. Hi, Can somebody tell me Advantages disadvantages of IP unnumbered system. TIA Gm. _ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com. _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: IP Unnumbered.
There is one huge disadvantage. If the ether segment goes down in an ip unnumbered setup, then even if everything is physically ok on the serial link associated, that serial link will become unusable. From a monitoring perspective, unnumbered is a bad idea. I suspect some people use it to save ip space. Brian On Mon, 16 Oct 2000, Gunjan Mathur at 9netave wrote: Hi, Can somebody tell me Advantages disadvantages of IP unnumbered system. TIA Gm. _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: IP Unnumbered.
unnumbered interfaces also present design problems when designing a scalable IGP. Brian On Mon, 16 Oct 2000, Erick B. wrote: Advantages: Saves on IP address space if you don't have networks to spare. Disadvantages: Harder to troubleshoot problems since you can't ping the unnumbered interface to see if it's down, etc. --- Gunjan Mathur at 9netave [EMAIL PROTECTED] wrote: Hi, Can somebody tell me Advantages disadvantages of IP unnumbered system. __ Do You Yahoo!? Yahoo! Messenger - Talk while you surf! It's FREE. http://im.yahoo.com/ _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] --- Brian Feeny, CCNP, CCDP [EMAIL PROTECTED] Network Administrator ShreveNet Inc. (ASN 11881) _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: IP Unnumbered.
Of course, you can always use a loopback address as the 'unnumbered' address, which gets around the problems of the ethernet availability. Obviously the loopback interface uses an address itself, but depending on whether you're using a loopback interface anyway, and how many unnumbered interfaces refer to it, unnumbered with a loopback can still save IP addresses. JMcL -- Forwarded by Jenny Mcleod/NSO/CSDA on 17/10/2000 11:23 am --- "Brian W." [EMAIL PROTECTED] on 17/10/2000 09:31:40 am Please respond to "Brian W." [EMAIL PROTECTED] To: Gunjan Mathur at 9netave [EMAIL PROTECTED] cc: [EMAIL PROTECTED] (bcc: JENNY MCLEOD/NSO/CSDA) Subject: Re: IP Unnumbered. There is one huge disadvantage. If the ether segment goes down in an ip unnumbered setup, then even if everything is physically ok on the serial link associated, that serial link will become unusable. From a monitoring perspective, unnumbered is a bad idea. I suspect some people use it to save ip space. Brian On Mon, 16 Oct 2000, Gunjan Mathur at 9netave wrote: Hi, Can somebody tell me Advantages disadvantages of IP unnumbered system. TIA Gm. _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: IP Unnumbered.
Thanks Ms. Jenny. I was wondering whether loopback was an option. The numbering of the Unumbered was getting to me. :) Dale CCNA Original Message Follows From: [EMAIL PROTECTED] Reply-To: [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: Re: IP Unnumbered. Date: Tue, 17 Oct 2000 11:25:13 +1100 Of course, you can always use a loopback address as the 'unnumbered' address, which gets around the problems of the ethernet availability. Obviously the loopback interface uses an address itself, but depending on whether you're using a loopback interface anyway, and how many unnumbered interfaces refer to it, unnumbered with a loopback can still save IP addresses. JMcL -- Forwarded by Jenny Mcleod/NSO/CSDA on 17/10/2000 11:23 am --- "Brian W." [EMAIL PROTECTED] on 17/10/2000 09:31:40 am Please respond to "Brian W." [EMAIL PROTECTED] To: Gunjan Mathur at 9netave [EMAIL PROTECTED] cc: [EMAIL PROTECTED] (bcc: JENNY MCLEOD/NSO/CSDA) Subject: Re: IP Unnumbered. There is one huge disadvantage. If the ether segment goes down in an ip unnumbered setup, then even if everything is physically ok on the serial link associated, that serial link will become unusable. From a monitoring perspective, unnumbered is a bad idea. I suspect some people use it to save ip space. Brian On Mon, 16 Oct 2000, Gunjan Mathur at 9netave wrote: Hi, Can somebody tell me Advantages disadvantages of IP unnumbered system. TIA Gm. _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com. _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: IP Unnumbered.
There is one huge disadvantage. If the ether segment goes down in an ip unnumbered setup, then even if everything is physically ok on the serial link associated, that serial link will become unusable. From a monitoring perspective, unnumbered is a bad idea. I suspect some people use it to save ip space. Brian So you've established that ip unnumbered is a serial killer. On Mon, 16 Oct 2000, Gunjan Mathur at 9netave wrote: Hi, Can somebody tell me Advantages disadvantages of IP unnumbered system. _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: ip unnumbered??
Frame-relay providers are not at all concerneted with your layer 3 addressing (IP). They are strickly involved with layer2 in this case your DLCI. All routing in their network is based on the DLCI not the IP. The router in the customer network will make the IP routing decisions which in turn are mapped to Frame-relay DLCI's. If using map commands you can see. Frame-relay map IP 1.1.1.1 200 broadcast. (This tells the router that IP address 1.1.1.1/subnet is mapped to DLCI 200. The IP unmunbered in this case is taking the same subnet from E0 and placing it on the frame-circuit (Layer 3). This cuts down the the number of IP subnets and routing table size used in a network. Hope this helps? Dan From: "Niraj Palikhey" [EMAIL PROTECTED] Reply-To: "Niraj Palikhey" [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: ip unnumbered?? Date: Wed, 19 Jul 2000 10:18:06 EDT Hi, I am trying to understand why a serial connection (s0) is not assigned an ip address to connect with the service provider when configured for frame relay. As a configuration example that one of my friends showed me, his serial 0 is configured for T1, with no ip address, serial 0.2 is configured for frame relay as a point-to-point subinterface. There is an ip unnumbered Ethernet0/0 command for this interface and also the frame relay configuration is set (dlci #, lmi type etc) What does this ip unnumbered do in this case? Pg. 417 and 418 of the ICRC book from Cisco Press for CCNA 640-407 does not explain why the physical interface serial 2 and sub-interface serial 2.2 point-to-point is not configured with any ip address NOR does it explain the use of the ip unnumbered Serial1(in this case). In this scenario, how does this router talk to the service provider's router? Does it just look at the DLCI number and use the virtual circuit for communication to the outside? What is involved? Please advise. Thank you. Kind regards, [EMAIL PROTECTED] Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: ip unnumbered??
On Wed, 19 Jul 2000, Niraj Palikhey wrote: Hi, I am trying to understand why a serial connection (s0) is not assigned an ip address to connect with the service provider when configured for frame relay. Because you don't need to assign a PtP link its own IP address. The traffic can really only go one place..the other end of the pipe. IP Unnumbered can be use. As a configuration example that one of my friends showed me, his serial 0 is configured for T1, with no ip address, serial 0.2 is configured for frame relay as a point-to-point subinterface. There is an ip unnumbered Yes. When you do subinterfaces, you don't have to have an ip address or even ip unnumbered on the physical interface. You can think of that sort of like an Extended hard drive partition, and the subinterfaces are logicals within the extended (now is that a bad analogy or what!?) Some people don't like to use the physical interfacelike s0/0...they prefer to just use the subinterfaces s0/0.1, s0/0.2..and leave the physical interface just out there. Ethernet0/0 command for this interface and also the frame relay configuration is set (dlci #, lmi type etc) What does this ip unnumbered do in this case? IP unnumbered tells the serial interface to use the ip of the interface you specify. Its very common to use ip unnumbered to an ethernet interface...for example. If you have a router with a single ethernet and a single serial PtP link. You can just use ip unnumbered. Alot of "consumer" ISDN routers work this wayyou don't number the serial WAN interface and the ethernet LAN interface, you just assign the router one ip number and thats used on all interfaces. This IMHO, is good for stubs who are routed a subnet and thats not going to change. I personally prefer to use numbered interfaces, because you must use numbered interfaces if using a Routing protocol such as OSPF. Sometimes people make the argument that they don't have the necessary ip numbers to make /30's for the PtP links. You can use RFC 1918 speace, with no translation needed, so long as its on your side of the border router. This could break MTU Path Discovery, but you just have to ask yourself what your needs are. Pg. 417 and 418 of the ICRC book from Cisco Press for CCNA 640-407 does not explain why the physical interface serial 2 and sub-interface serial 2.2 point-to-point is not configured with any ip address NOR does it explain the use of the ip unnumbered Serial1(in this case). In this scenario, how does this router talk to the service provider's router? Does it just look at the DLCI number and use the virtual circuit for communication to the outside? What is involved? Please advise. Thank you. Kind regards, [EMAIL PROTECTED] Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] - Brian Feeny, CCNA [EMAIL PROTECTED] 318-222-2638 x 109 http://www.shreve.net/~signal Network Administrator ShreveNet Inc. (ASN 11881) ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: ip unnumbered
No, packets that don't belong to the same subet will be routed out. -Apoorva Mahesh Gupta wrote: Will the broadcast packets cross the router in this case ?? as router is a part of the same subnet which is available across a point to point serially connected networks. Mahesh -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Justin Marcus Sent: Wednesday, June 07, 2000 4:41 PM To: ALI SHEERAZ Cc: [EMAIL PROTECTED] Subject: Re: ip unnumbered if your ethernet0 is 10.0.0.1 and you make your serial0 have that unnumbered thingy so both your serial and ethernet have 10.0.0.1 does that mean the remote site your connecting to will have to have an address like 10.0.0.2 so its in the same network as your serial0 ? thanks :) On Tue, 6 Jun 2000, ALI SHEERAZ wrote: The "ip unnumbered" configuration command allows you to enable IP processing on a serial interface without assigning it an explicit IP address. This is a good way to conserve network and address space. Consider a class B network subnetted with eight bits. Every interface in the network including the serial lines will require a subnet. Since each serial line has only two nodes, this wastes 252 addresses on each serial line. Here's where IP unnumbered comes in handy. For any point-to-point serial link or point-to-point sub- interface, IP unnumbered lets you borrow the address of some LAN interface to use as a source address for routing updates and packets from that interface. No network is wasted, and precious address space is conserved. IP Unnumbered is used for point-to-point links. Command Syntax --- interface Ethernet0 ip address 171.68.178.196 255.255.255.192 interface Serial1 ip unnumbered Ethernet0 router igrp 10 network 171.68.0.0 Hi fellows could anybody explain to me what "ip unnumbered" command is, and how it is used? thanks in advance. Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] --- ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: ip unnumbered
Yes, provided your ethernet has a valid ip address. It is usually allocated by your ISP. For Ex. your netblock - 202.35.2.0/29 ISP side - their T1 interface 204.208.22.1 ISPside - IP route 202.35.2.0 255.255.255.248 204.208.22.1 your side - T1 interface , S0 unnumbered your side - Ethernet int, E0 202.35.2.1 Traffic destined for 202.35.2.0/29 from the internet will be routed by your ISP to your routers S0. What happens is that your routers S0 grabs your E0 ip address and communicates based on it. Hope that helps. -Apoorva "ANIL.YADAV" wrote: So can I use the command interface serial 1 ip unnumbered serial 0 Anil so as to assifgn same ip address to the two serial interfaces. On Tue, 6 Jun 2000, ALI SHEERAZ wrote: The "ip unnumbered" configuration command allows you to enable IP processing on a serial interface without assigning it an explicit IP address. This is a good way to conserve network and address space. Consider a class B network subnetted with eight bits. Every interface in the network including the serial lines will require a subnet. Since each serial line has only two nodes, this wastes 252 addresses on each serial line. Here's where IP unnumbered comes in handy. For any point-to-point serial link or point-to-point sub- interface, IP unnumbered lets you borrow the address of some LAN interface to use as a source address for routing updates and packets from that interface. No network is wasted, and precious address space is conserved. IP Unnumbered is used for point-to-point links. Command Syntax --- interface Ethernet0 ip address 171.68.178.196 255.255.255.192 interface Serial1 ip unnumbered Ethernet0 router igrp 10 network 171.68.0.0 Hi fellows could anybody explain to me what "ip unnumbered" command is, and how it is used? thanks in advance. Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] --- ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: ip unnumbered
jeongwoo, Simply put "ip unnumbered" allows you to use the network or subnet address of the local LAN -interface(i.e e0, t0) as the routers network or subnetwork address for point-to-point links. This basically helps you conserve address space by letting you use the already assigned ip address from you local LAN interface treating the serial interface almost like a sub-interface if you will. This only works for point-to-point links as I mentioned before. An example RouterA# ! ! Ethernet 0 ip address 172.16.10.1 255.255.0.0 ! Serial 0 ip unnumbered(picks up the ip address of ethernet 0 - 172.16.10.1 for routing) HTH Nigel - Original Message - From: jeongwoo park [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Tuesday, June 06, 2000 9:55 AM Subject: ip unnumbered Hi fellows could anybody explain to me what "ip unnumbered" command is, and how it is used? thanks in advance. iWon.com http://www.iwon.com why wouldn't you? ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: ip unnumbered
Hi, Here you go... To conserve IP addresses, configure the asynchronous interfaces as unnumbered, and assign the IP address of the loopback interface or an ethernet interface to them. ! interface ethernet 0 ip address 192.0.0.5 255.255.255.0 ! interface serial 0 ip unnumbered ethernet 0 encapsulation ppp ! Here the serial interface uses the IP address of the ethernet interface so it saves ip addresses (it also saves routing updates) Regards Robert jeongwoo park wrote: Hi fellows could anybody explain to me what "ip unnumbered" command is, and how it is used? thanks in advance. iWon.com http://www.iwon.com why wouldn't you? ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] -- -- Robert LAKE MSc - Customer Support Engineer | | E-Mail: [EMAIL PROTECTED] | | Phone : +32 2 704 5434 ||| ||| Fax : +32 2 704 5804 | | Parc Pegasus ..:|||:...:|||:.. De Kleetlaan, 6C i s c o S y s t e m s B-1831 - Diegem - Belgium Euro TAC - Brussels -- Cisco Systems - Empowering the Internet Generation -- ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: ip unnumbered
The "ip unnumbered" configuration command allows you to enable IP processing on a serial interface without assigning it an explicit IP address. This is a good way to conserve network and address space. Consider a class B network subnetted with eight bits. Every interface in the network including the serial lines will require a subnet. Since each serial line has only two nodes, this wastes 252 addresses on each serial line. Here's where IP unnumbered comes in handy. For any point-to-point serial link or point-to-point sub- interface, IP unnumbered lets you borrow the address of some LAN interface to use as a source address for routing updates and packets from that interface. No network is wasted, and precious address space is conserved. IP Unnumbered is used for point-to-point links. Command Syntax --- interface Ethernet0 ip address 171.68.178.196 255.255.255.192 interface Serial1 ip unnumbered Ethernet0 router igrp 10 network 171.68.0.0 Hi fellows could anybody explain to me what "ip unnumbered" command is, and how it is used? thanks in advance. Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: ip unnumbered
Another thought - You want to keep in mind though, that for troubleshooting purposes, you lose the ability to ping the serial interface because it is ip unnumbered. (IE you would be pinging the lan interface not the serial interface.) Scott Chapin CCNA -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of jeongwoo park Sent: Tuesday, June 06, 2000 3:56 AM To: [EMAIL PROTECTED] Subject: ip unnumbered Hi fellows could anybody explain to me what "ip unnumbered" command is, and how it is used? thanks in advance. iWon.com http://www.iwon.com why wouldn't you? ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: ip unnumbered
No, the addresses don't have to match. You would usually use ip unnumbered on both ends of the link (in fact you may have to - don't know, haven't experimented), so the addresses can be (and generally are) completely different. JMcL -- Forwarded by Jenny Mcleod/NSO/CSDA on 07/06/2000 09:10 --- Justin Marcus [EMAIL PROTECTED] on 07/06/2000 21:11:11 Please respond to Justin Marcus [EMAIL PROTECTED] To: ALI SHEERAZ [EMAIL PROTECTED] cc: [EMAIL PROTECTED] (bcc: JENNY MCLEOD/NSO/CSDA) Subject: Re: ip unnumbered if your ethernet0 is 10.0.0.1 and you make your serial0 have that unnumbered thingy so both your serial and ethernet have 10.0.0.1 does that mean the remote site your connecting to will have to have an address like 10.0.0.2 so its in the same network as your serial0 ? thanks :) On Tue, 6 Jun 2000, ALI SHEERAZ wrote: The "ip unnumbered" configuration command allows you to enable IP processing on a serial interface without assigning it an explicit IP address. This is a good way to conserve network and address space. Consider a class B network subnetted with eight bits. Every interface in the network including the serial lines will require a subnet. Since each serial line has only two nodes, this wastes 252 addresses on each serial line. Here's where IP unnumbered comes in handy. For any point-to-point serial link or point-to-point sub- interface, IP unnumbered lets you borrow the address of some LAN interface to use as a source address for routing updates and packets from that interface. No network is wasted, and precious address space is conserved. IP Unnumbered is used for point-to-point links. Command Syntax --- interface Ethernet0 ip address 171.68.178.196 255.255.255.192 interface Serial1 ip unnumbered Ethernet0 router igrp 10 network 171.68.0.0 Hi fellows could anybody explain to me what "ip unnumbered" command is, and how it is used? thanks in advance. Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: ip unnumbered
Is does mean that ip unnumbered can't be used if we use point to multipoit link such as Frame Relay or ATM ? -- From: ALI SHEERAZ[SMTP:[EMAIL PROTECTED]] Reply To: ALI SHEERAZ Sent: Tuesday, June 06, 2000 5:08 PM To: [EMAIL PROTECTED] Subject: Re: ip unnumbered The "ip unnumbered" configuration command allows you to enable IP processing on a serial interface without assigning it an explicit IP address. This is a good way to conserve network and address space. Consider a class B network subnetted with eight bits. Every interface in the network including the serial lines will require a subnet. Since each serial line has only two nodes, this wastes 252 addresses on each serial line. Here's where IP unnumbered comes in handy. For any point-to-point serial link or point-to-point sub- interface, IP unnumbered lets you borrow the address of some LAN interface to use as a source address for routing updates and packets from that interface. No network is wasted, and precious address space is conserved. IP Unnumbered is used for point-to-point links. Command Syntax --- interface Ethernet0 ip address 171.68.178.196 255.255.255.192 interface Serial1 ip unnumbered Ethernet0 router igrp 10 network 171.68.0.0 Hi fellows could anybody explain to me what "ip unnumbered" command is, and how it is used? thanks in advance. Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
