Chuck wrote: > > hhmmmmm........ learn something new every day. thanks. > > that still gets back to how ip unnumbered "really" works, as > opposed to how > most of us "think" it works. RFC 1812 specifically talks about > using the RID > as the interface address: > > "this memo has adopted an alternate scheme, which has been > invented > multiple times but which is probably originally attributable > to Phil Karn. > In this scheme, a router that has unnumbered point to point > lines also has > a special IP address, called a router-id in this memo. The > router-id is one > of the router's IP addresses (a router is required to have at > least one IP > address). This router-id is used as if it is the IP address of > all > unnumbered interfaces." > > whaddaya know - I did recall correctly :-> > > so it would appear that in the Cisco implementation, at least, > for > unnumbered interfaces, the reference interface ip also becomes > the RID for > purposes of unnumbered? > > So what does this discovery do to the proposition that one > "should" use a > loopback as the reference for unnumbered interfaces because > loopbacks are > "never down"???
Good point Chuck. Peter, I did not know the meaning of "quote", hehe. > > interesting discussion. learned something new. > > Chuck > > > > > ""richard dumoulin"" wrote in message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > No prob, see below. > > > > > > > > RB#sh run > > Building configuration... > > > > Current configuration: > > ! > > version 11.2 > > no service password-encryption > > no service udp-small-servers > > no service tcp-small-servers > > ! > > hostname RB > > ! > > enable password cisco > > ! > > no ip domain-lookup > > ! > > interface Ethernet0 > > ip address 192.168.1.1 255.255.255.0 > > ! > > interface Serial0 > > ip unnumbered Ethernet0 > > ! > > interface Serial1 > > no ip address > > shutdown > > ! > > interface Serial2 > > no ip address > > shutdown > > ! > > interface Serial3 > > no ip address > > shutdown > > ! > > interface Serial4 > > no ip address > > shutdown > > ! > > interface Serial5 > > no ip address > > shutdown > > ! > > interface Serial6 > > no ip address > > shutdown > > ! > > interface Serial7 > > no ip address > > shutdown > > ! > > interface Serial8 > > no ip address > > shutdown > > ! > > interface Serial9 > > no ip address > > shutdown > > ! > > interface BRI0 > > no ip address > > shutdown > > ! > > no ip classless > > ip route 0.0.0.0 0.0.0.0 Serial0 > > ! > > line con 0 > > line aux 0 > > line vty 0 4 > > password cisco > > login > > ! > > end > > > > RB#172.16.1.1 > > Trying 172.16.1.1 ... Open > > > > > > User Access Verification > > > > Password: > > RA>en > > Password: > > RA#sh run > > Building configuration... > > > > Current configuration : 801 bytes > > ! > > version 12.2 > > service timestamps debug uptime > > service timestamps log uptime > > no service password-encryption > > ! > > hostname RA > > ! > > enable password cisco > > ! > > memory-size iomem 10 > > ip subnet-zero > > ! > > ! > > no ip domain-lookup > > ! > > ip ssh time-out 120 > > ip ssh authentication-retries 3 > > ! > > call rsvp-sync > > ! > > ! > > ! > > ! > > ! > > ! > > ! > > ! > > interface Ethernet0/0 > > ip address 172.16.1.1 255.255.0.0 > > no keepalive > > half-duplex > > ! > > interface Serial0/0 > > no ip address > > shutdown > > ! > > interface Serial0/1 > > no ip address > > shutdown > > ! > > interface Serial0/2 > > ip unnumbered Ethernet0/0 > > clockrate 2000000 > > ! > > interface Serial0/3 > > no ip address > > shutdown > > ! > > ip classless > > ip route 0.0.0.0 0.0.0.0 Serial0/2 > > no ip http server > > ! > > ! > > ! > > dial-peer cor custom > > ! > > ! > > ! > > ! > > ! > > line con 0 > > line aux 0 > > line vty 0 4 > > password cisco > > login > > line vty 5 15 > > login > > ! > > no scheduler allocate > > end > > > > RA# > > RB# > > [Resuming connection 1 to 172.16.1.1 ... ] > > > > RA# > > RA# > > RB#172.16.1.1 > > Trying 172.16.1.1 ... Open > > > > > > User Access Verification > > > > Password: > > RA>en > > Password: > > RA#ping 192.168.1.1 > > > > Type escape sequence to abort. > > Sending 5, 100-byte ICMP Echos to 192.168.1.1, timeout is 2 > seconds: > > !!!!! > > Success rate is 100 percent (5/5), round-trip min/avg/max = > 4/4/8 ms > > RA# > > RB#term mon > > % Console already monitors > > RB# > > %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0, > changed state > to > > down > > [Resuming connection 2 to 172.16.1.1 ... ] > > > > RA#ping 192.168.1.1 > > > > Type escape sequence to abort. > > Sending 5, 100-byte ICMP Echos to 192.168.1.1, timeout is 2 > seconds: > > !!!!! > > Success rate is 100 percent (5/5), round-trip min/avg/max = > 4/4/8 ms > > RA#ping 192.168.1.1 > > > > Type escape sequence to abort. > > Sending 5, 100-byte ICMP Echos to 192.168.1.1, timeout is 2 > seconds: > > !!!!! > > Success rate is 100 percent (5/5), round-trip min/avg/max = > 4/5/8 ms > > RA# > > RB#conf t > > Enter configuration commands, one per line. End with CNTL/Z. > > RB(config)#int e0 > > RB(config-if)#shut > > RB(config-if)# > > %LINK-5-CHANGED: Interface Ethernet0, changed state to > administratively > > down^Z > > RB#d > > %SYS-5-CONFIG_I: Configured from console by consoleeb ip pa > det > > IP packet debugging is on (detailed) > > RB# > > [Resuming connection 2 to 172.16.1.1 ... ] > > > > RA# > > IP: s=192.168.1.1 (local), d=172.16.1.1 (Serial0), len 40, > sending > > TCP src=11001, dst=23, seq=3044171494, ack=4024004928, > win=4288 ACK > > IP: s=192.168.1.1 (local), d=172.16.1.1 (Serial0), len 42, > sending > > TCP src=11001, dst=23, seq=3044171494, ack=4024004928, > win=4288 ACK > PSH > > IP: s=172.16.1.1 (Serial0), d=192.168.1.1 (Serial0), len 42, > rcvd 3 > > TCP src=23, dst=11001, seq=4024004928, ack=3044171496, > win=4058 ACK > PSH > > IP: s=172.16.1.1 (Serial0), d=192.168.1.1 (Serial0), len 43, > rcvd 3 > > TCP src=23, dst=11001, seq=4024004930, ack=3044171496, > win=4058 ACK > PSH > > IP: s=192.168.1.1 (local), d=172.16.1.1 (Serial0), len 40, > sending > > TCP src=11001, dst=23, seq=3044171496, ack=4024004933, > win=4283 > ACKping > > 192.168.1.1 > > > > Type escape sequence to abort. > > Sending 5, 100-byte ICMP Echos to 192.168.1.1, timeout is 2 > seconds: > > !! > > IP: s=192.168.1.1 (local), d=172.16.1.1 (Serial0), len 41, > sending > > TCP src=11001, dst=23, seq=3044171496, ack=4024004933, > win=4283 ACK > PSH > > IP: s=172.16.1.1 (Serial0), d=192.168.1.1 (Serial0), len 56, > rcvd 3 > > TCP src=23, dst=11001, seq=4024004933, ack=3044171497, > win=4057 ACK > PSH > > IP: s=192.168.1.1 (local), d=172.16.1.1 (Serial0), len 40, > sending > > TCP src=11001, dst=23, seq=3044171497, ack=4024004949, > win=4267 ACK > > IP: s=192.168.1.1 (local), d=172.16.1.1 (Serial0), len 42, > sending > > TCP s!!! > > Success rate is 100 percent (5/5), round-trip min/avg/max = > 12/16/20 ms > > RA#rc=11001, dst=23, seq=3044171497, ack=4024004949, win=4267 > ACK PSH > > IP: s=172.16.1.1 (Serial0), d=192.168.1.1 (Serial0), len 42, > rcvd 3 > > TCP src=23, dst=11001, seq=4024004949, ack=3044171499, > win=4055 ACK > PSH > > IP: s=172.16.1.1 (Serial0), d=192.168.1.1 (Serial0), len 142, > rcvd 3 > > TCP src=23, dst=11001, seq=4024004951, ack=3044171499, > win=4055 ACK > PSH > > IP: s=172.16.1.1 (Serial0), d=192.168.1.1 (Serial0), len 42, > rcvd 3 > > TCP src=23, dst=11001, seq=4024005053, ack=3044171499, > win=4055 ACK > PSH > > IP: s=172.16.1.1 (Serial0), d=192.168.1.1 (Serial0), len 100, > rcvd 3 > > ICMP type=8, code=0 > > IP: s=192.168.1.1 (local), d=172.16.1.1 (Serial0), len 100, > sending > > ICMP type=0, code=0 > > IP: s=172.16.1.1 (Serial0), d=192.168.1.1 (Serial0), len 41, > rcvd 3 > > TCP src=23, dst=11001, seq=4024005055, ack=3044171499, > win=4055 ACK > PSH > > IP: s=172.16.1.1 (Serial0), d=192.168.1.1 (Serial0), len 100, > rcvd 3 > > ICMP type=8, code=0 > > IP: s=192.168.1.1 (local), d=172.16.1.1 (Serial0), len 100, > sending > > ICMP type=0, code=0 > > IP: s=172.16.1.1 (Serial0), d=192.168.1.1 (Serial0), len 41, > rcvd 3 > > TCP src=23, dst=11001, seq=4024005056, ack=3044171499, > win=4055 ACK > PSH > > IP: s=172.16.1.1 (Serial0), d=192.168.1.1 (Serial0), len 100, > rcvd 3 > > ICMP type=8, code=0 > > IP: s=192.168.1.1 (local), d=172.16.1.1 (Serial0), len 100, > sending > > ICMP type=0, code=0 > > IP: s=192.168.1.1 (local), d=172.16.1.1 (Serial0), len 40, > sending > > TCP src=11001, dst=23, seq=3044171499, ack=4024005057, > win=4159 ACK > > IP: s=172.16.1.1 (Serial0), d=192.168.1.1 (Serial0), len 41, > rcvd 3 > > TCP src=23, dst=11001, seq=4024005057, ack=3044171499, > win=4055 ACK > PSH > > IP: s=172.16.1.1 (Serial0), d=192.168.1.1 (Serial0), len 100, > rcvd 3 > > ICMP type=8, code=0 > > IP: s=192.168.1.1 (local), d=172.16.1.1 (Serial0), len 100, > sending > > ICMP type=0, code=0 > > IP: s=172.16.1.1 (Serial0), d=192.168.1.1 (Serial0), len 41, > rcvd 3 > > TCP src=23, dst=11001, seq=4024005058, ack=3044171499, > win=4055 ACK > PSH > > IP: s=172.16.1.1 (Serial0), d=192.168.1.1 (Serial0), len 100, > rcvd 3 > > ICMP type=8, code=0 > > IP: s=192.168.1.1 (local), d=172.16.1.1 (Serial0), len 100, > sending > > ICMP type=0, code=0 > > IP: s=172.16.1.1 (Serial0), d=192.168.1.1 (Serial0), len 41, > rcvd 3 > > TCP src=23, dst=11001, seq=4024005059, ack=3044171499, > win=4055 ACK > PSH > > IP: s=172.16.1.1 (Serial0), d=192.168.1.1 (Serial0), len 118, > rcvd 3 > > TCP src=23, dst=11001, seq=4024005060, ack=3044171499, > win=4055 ACK > PSH > > IP: s=192.168.1.1 (local), d=172.16.1.1 (Serial0), len 40, > sending > > TCP src=11001, dst=23, seq=3044171499, ack=4024005138, > win=4078 ACK > > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=49402&t=49347 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
