RE: DHCP [7:21051]
as long as we're on the subject of DHCP, I'm wondering if someone can point me to a reference giving the specifics of the DHCP option numbers ( without pointing me to The DHCP Handbook, which I don't have time to read right now ) I ran a cross a situation where I needed to understand some of the option numbers, and what they meant. The RFC's I checked mentioned options but did not specify the numbers and their associated services. I did find the specific answer I required on CCO ( believe it or not ) but it occurs to me that it would be handy to have a reference. ( RFC 1533 did not list options above 61. RFC 2132 list one of the options I was looking for, but stops at so. none of the other couple - out of 20 - that I browsed looked promising. I checked IANA, but I didn't think I would find anything there, and I was right. ) Chuck -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Priscilla Oppenheimer Sent: Wednesday, September 26, 2001 6:24 PM To: [EMAIL PROTECTED] Subject: Re: DHCP [7:21051] At 05:14 PM 9/26/01, Brian wrote: Yeah I always thought the helper address command was the way to get a whole bunch of nonroutable junk forwarded. It gets a bunch of UDP broadcasts forwarded. I figured out the ip dhcp-server command. It's not a replacement for ip helper-address. It's for access servers. It's only documented in access server documentation and documentation for the Gateway General Packet Radio Service (GPRS) Support Node (GGSN), whatever that is. The GGSN provides services to wireless devices, that much I know, and it's sort of an access server for the purposes of this discussion. So dial-up users, wireless users, etc. reach the Internet or corporate intranet through the access server. With ip dhcp-server you can make sure the access server gives these users an IP address because it forwards their requests (or asks on its own) to a DHCP server. Note that if the DHCP server is not on the same LAN as the access server, then you need to configure ip helper-address on intermediate routers between the access server and DHCP server. ip helper-address is also used for the more common situations, for example, when clients are on a different LAN than the DHCP server. ip dhcp-server didn't work in this case, per my previous message. I'd love to hear any more uses for ip dhcp-server if they exist. I would think that access server could also mean a DSL or cable modem router, but I don't see any evidence of the ip dhcp-server command being documented for those environments. (The command definitely doesn't turn the router into a DHCP server a I originally said, sorry. I feel sort of justified for that mistake, though since the other ip dhcp commands do that. ;-) Priscilla Bri Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=21260t=21051 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: DHCP [7:21051]
Hello, ip dhcp-server works, I didn't specify it with a hyphen. So would you agree that the best solution for me would be to disable ip directed broadcast, ip helper address and enable ip dhcp-server at the global config? If I enable ip dhcp-server do I need to enable ip forward-protocol udp (ports 66 and 67)? Thanks a lot, Alex MADMAN wrote: Hmm.. I haven't done it in a while so I tried it on a 7507 with RSP8's and an MSFC2, they both accepted the command just fine but are not in the config. So I figured they must be enabled by default so I did a no ip forward protocol udp 67 and wallah, there it is!!! C7507MIX#conf t Enter configuration commands, one per line. End with CNTL/Z. C7507MIX(config)#no ip for C7507MIX(config)#no ip forward-protocol udp 67 C7507MIX(config)#^Z C7507MIX#wr t Building configuration...ip kerberos source-interface any ip classless no ip forward-protocol udp bootps Dave khramov wrote: I did that, but when I do sh run it is not showing up in config file. I mean (ip forward-protocol udp 67). Is that the way it is suppose to be? MADMAN wrote: Check ip foward protocol Dave khramov wrote: Hello How do I enable broadcast for DHCP server? I know that ip helper enables UDP broadcast, but broadcast of netbios services causes some problems for win nt server. So I guess to be more specific what can I do to forward udp broadcast on ports 67 and 68 only? And another question that I have what exactly ip directed-broadcast command does? I've searched Cisco's web site but I never came across a clear defenition? Thanks, Alex [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland CCIE# 2016 Senior Network Engineer Qwest Communications 612-664-3367 [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=21133t=21051 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: DHCP [7:21051]
I think if you configure the router for 'ip dhcp-server' you are configuring the router as a dhcp server. If you want to do that you need to configure a address pool as well. -Eric -Original Message- From: khramov [mailto:[EMAIL PROTECTED]] Sent: Wednesday, September 26, 2001 8:24 AM To: [EMAIL PROTECTED] Subject: Re: DHCP [7:21051] Hello, ip dhcp-server works, I didn't specify it with a hyphen. So would you agree that the best solution for me would be to disable ip directed broadcast, ip helper address and enable ip dhcp-server at the global config? If I enable ip dhcp-server do I need to enable ip forward-protocol udp (ports 66 and 67)? Thanks a lot, Alex MADMAN wrote: Hmm.. I haven't done it in a while so I tried it on a 7507 with RSP8's and an MSFC2, they both accepted the command just fine but are not in the config. So I figured they must be enabled by default so I did a no ip forward protocol udp 67 and wallah, there it is!!! C7507MIX#conf t Enter configuration commands, one per line. End with CNTL/Z. C7507MIX(config)#no ip for C7507MIX(config)#no ip forward-protocol udp 67 C7507MIX(config)#^Z C7507MIX#wr t Building configuration...ip kerberos source-interface any ip classless no ip forward-protocol udp bootps Dave khramov wrote: I did that, but when I do sh run it is not showing up in config file. I mean (ip forward-protocol udp 67). Is that the way it is suppose to be? MADMAN wrote: Check ip foward protocol Dave khramov wrote: Hello How do I enable broadcast for DHCP server? I know that ip helper enables UDP broadcast, but broadcast of netbios services causes some problems for win nt server. So I guess to be more specific what can I do to forward udp broadcast on ports 67 and 68 only? And another question that I have what exactly ip directed-broadcast command does? I've searched Cisco's web site but I never came across a clear defenition? Thanks, Alex [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland CCIE# 2016 Senior Network Engineer Qwest Communications 612-664-3367 [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=21137t=21051 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: DHCP [7:21051]
Alex, Ip dhcp-server should be sufficient for your needs. Nothing else should need to be enabled. Try it out. Tim Booth - Original Message - From: khramov To: Sent: Wednesday, September 26, 2001 8:24 AM Subject: Re: DHCP [7:21051] Hello, ip dhcp-server works, I didn't specify it with a hyphen. So would you agree that the best solution for me would be to disable ip directed broadcast, ip helper address and enable ip dhcp-server at the global config? If I enable ip dhcp-server do I need to enable ip forward-protocol udp (ports 66 and 67)? Thanks a lot, Alex MADMAN wrote: Hmm.. I haven't done it in a while so I tried it on a 7507 with RSP8's and an MSFC2, they both accepted the command just fine but are not in the config. So I figured they must be enabled by default so I did a no ip forward protocol udp 67 and wallah, there it is!!! C7507MIX#conf t Enter configuration commands, one per line. End with CNTL/Z. C7507MIX(config)#no ip for C7507MIX(config)#no ip forward-protocol udp 67 C7507MIX(config)#^Z C7507MIX#wr t Building configuration...ip kerberos source-interface any ip classless no ip forward-protocol udp bootps Dave khramov wrote: I did that, but when I do sh run it is not showing up in config file. I mean (ip forward-protocol udp 67). Is that the way it is suppose to be? MADMAN wrote: Check ip foward protocol Dave khramov wrote: Hello How do I enable broadcast for DHCP server? I know that ip helper enables UDP broadcast, but broadcast of netbios services causes some problems for win nt server. So I guess to be more specific what can I do to forward udp broadcast on ports 67 and 68 only? And another question that I have what exactly ip directed-broadcast command does? I've searched Cisco's web site but I never came across a clear defenition? Thanks, Alex [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland CCIE# 2016 Senior Network Engineer Qwest Communications 612-664-3367 [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=21146t=21051 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: DHCP [7:21051]
Why do you want to turn your router into a DHCP server? I thought you already had a DHCP server. You just need a helper address and ip forward-protocol udp 67 no ip forward-protocol 137 no ip forward-protocol 138 The last two commands are because you said that NetBIOS broadcast forwarding was causing problems for your NT server. When you have a helper address, the router forwards a bunch of UDP packets. You have to configure it to be more discerning. Priscilla At 09:24 AM 9/26/01, khramov wrote: Hello, ip dhcp-server works, I didn't specify it with a hyphen. So would you agree that the best solution for me would be to disable ip directed broadcast, ip helper address and enable ip dhcp-server at the global config? If I enable ip dhcp-server do I need to enable ip forward-protocol udp (ports 66 and 67)? Thanks a lot, Alex MADMAN wrote: Hmm.. I haven't done it in a while so I tried it on a 7507 with RSP8's and an MSFC2, they both accepted the command just fine but are not in the config. So I figured they must be enabled by default so I did a no ip forward protocol udp 67 and wallah, there it is!!! C7507MIX#conf t Enter configuration commands, one per line. End with CNTL/Z. C7507MIX(config)#no ip for C7507MIX(config)#no ip forward-protocol udp 67 C7507MIX(config)#^Z C7507MIX#wr t Building configuration...ip kerberos source-interface any ip classless no ip forward-protocol udp bootps Dave khramov wrote: I did that, but when I do sh run it is not showing up in config file. I mean (ip forward-protocol udp 67). Is that the way it is suppose to be? MADMAN wrote: Check ip foward protocol Dave khramov wrote: Hello How do I enable broadcast for DHCP server? I know that ip helper enables UDP broadcast, but broadcast of netbios services causes some problems for win nt server. So I guess to be more specific what can I do to forward udp broadcast on ports 67 and 68 only? And another question that I have what exactly ip directed-broadcast command does? I've searched Cisco's web site but I never came across a clear defenition? Thanks, Alex [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland CCIE# 2016 Senior Network Engineer Qwest Communications 612-664-3367 [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=21181t=21051 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: DHCP [7:21051]
Priscilla and others: Ip dhcp-server does not turn your router into a dhcp server. It tells your router where your dhcp server is. Tim Booth - Original Message - From: Priscilla Oppenheimer To: Sent: Wednesday, September 26, 2001 12:12 PM Subject: Re: DHCP [7:21051] Why do you want to turn your router into a DHCP server? I thought you already had a DHCP server. You just need a helper address and ip forward-protocol udp 67 no ip forward-protocol 137 no ip forward-protocol 138 The last two commands are because you said that NetBIOS broadcast forwarding was causing problems for your NT server. When you have a helper address, the router forwards a bunch of UDP packets. You have to configure it to be more discerning. Priscilla At 09:24 AM 9/26/01, khramov wrote: Hello, ip dhcp-server works, I didn't specify it with a hyphen. So would you agree that the best solution for me would be to disable ip directed broadcast, ip helper address and enable ip dhcp-server at the global config? If I enable ip dhcp-server do I need to enable ip forward-protocol udp (ports 66 and 67)? Thanks a lot, Alex MADMAN wrote: Hmm.. I haven't done it in a while so I tried it on a 7507 with RSP8's and an MSFC2, they both accepted the command just fine but are not in the config. So I figured they must be enabled by default so I did a no ip forward protocol udp 67 and wallah, there it is!!! C7507MIX#conf t Enter configuration commands, one per line. End with CNTL/Z. C7507MIX(config)#no ip for C7507MIX(config)#no ip forward-protocol udp 67 C7507MIX(config)#^Z C7507MIX#wr t Building configuration...ip kerberos source-interface any ip classless no ip forward-protocol udp bootps Dave khramov wrote: I did that, but when I do sh run it is not showing up in config file. I mean (ip forward-protocol udp 67). Is that the way it is suppose to be? MADMAN wrote: Check ip foward protocol Dave khramov wrote: Hello How do I enable broadcast for DHCP server? I know that ip helper enables UDP broadcast, but broadcast of netbios services causes some problems for win nt server. So I guess to be more specific what can I do to forward udp broadcast on ports 67 and 68 only? And another question that I have what exactly ip directed-broadcast command does? I've searched Cisco's web site but I never came across a clear defenition? Thanks, Alex [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland CCIE# 2016 Senior Network Engineer Qwest Communications 612-664-3367 [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=21185t=21051 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: DHCP [7:21051]
Bravo, This makes the router a DHCP server: ip dhcp pool dave network 10.0.0.0 255.255.255.0 dns-server 172.28.2.217 172.28.2.10 default-router 10.0.0.1 Dave Tim Booth wrote: Priscilla and others: Ip dhcp-server does not turn your router into a dhcp server. It tells your router where your dhcp server is. Tim Booth - Original Message - From: Priscilla Oppenheimer To: Sent: Wednesday, September 26, 2001 12:12 PM Subject: Re: DHCP [7:21051] Why do you want to turn your router into a DHCP server? I thought you already had a DHCP server. You just need a helper address and ip forward-protocol udp 67 no ip forward-protocol 137 no ip forward-protocol 138 The last two commands are because you said that NetBIOS broadcast forwarding was causing problems for your NT server. When you have a helper address, the router forwards a bunch of UDP packets. You have to configure it to be more discerning. Priscilla At 09:24 AM 9/26/01, khramov wrote: Hello, ip dhcp-server works, I didn't specify it with a hyphen. So would you agree that the best solution for me would be to disable ip directed broadcast, ip helper address and enable ip dhcp-server at the global config? If I enable ip dhcp-server do I need to enable ip forward-protocol udp (ports 66 and 67)? Thanks a lot, Alex MADMAN wrote: Hmm.. I haven't done it in a while so I tried it on a 7507 with RSP8's and an MSFC2, they both accepted the command just fine but are not in the config. So I figured they must be enabled by default so I did a no ip forward protocol udp 67 and wallah, there it is!!! C7507MIX#conf t Enter configuration commands, one per line. End with CNTL/Z. C7507MIX(config)#no ip for C7507MIX(config)#no ip forward-protocol udp 67 C7507MIX(config)#^Z C7507MIX#wr t Building configuration...ip kerberos source-interface any ip classless no ip forward-protocol udp bootps Dave khramov wrote: I did that, but when I do sh run it is not showing up in config file. I mean (ip forward-protocol udp 67). Is that the way it is suppose to be? MADMAN wrote: Check ip foward protocol Dave khramov wrote: Hello How do I enable broadcast for DHCP server? I know that ip helper enables UDP broadcast, but broadcast of netbios services causes some problems for win nt server. So I guess to be more specific what can I do to forward udp broadcast on ports 67 and 68 only? And another question that I have what exactly ip directed-broadcast command does? I've searched Cisco's web site but I never came across a clear defenition? Thanks, Alex [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland CCIE# 2016 Senior Network Engineer Qwest Communications 612-664-3367 [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] Priscilla Oppenheimer http://www.priscilla.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=21189t=21051 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: DHCP [7:21051]
At 01:06 PM 9/26/01, khramov wrote: From my understanding ip dhcp-server command will enable upd broadcast on ports 66 and 67. Is that true? It causes your router to BE a DHCP server and to accept and process broadcasts to UDP port 67 and to send responses from port 66. It does not cause the router to forward UDP broadcasts to port 67. If you turn your router into a DHCP server, you would also have to identify an external File Transport Protocol (FTP), Trivial File Transfer Protocol (TFTP), or remote copy protocol (rcp) server that you will use to store the DHCP bindings database. The router will access that database. Here's more info on turning your router into a DHCP server, which is often not a good idea, in my opinion (because it detracts from the router's real jobs): http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fipr_c/ipcprt1/1cfdhcp.htm Priscilla Alex Priscilla Oppenheimer wrote: Why do you want to turn your router into a DHCP server? I thought you already had a DHCP server. You just need a helper address and ip forward-protocol udp 67 no ip forward-protocol 137 no ip forward-protocol 138 The last two commands are because you said that NetBIOS broadcast forwarding was causing problems for your NT server. When you have a helper address, the router forwards a bunch of UDP packets. You have to configure it to be more discerning. Priscilla At 09:24 AM 9/26/01, khramov wrote: Hello, ip dhcp-server works, I didn't specify it with a hyphen. So would you agree that the best solution for me would be to disable ip directed broadcast, ip helper address and enable ip dhcp-server at the global config? If I enable ip dhcp-server do I need to enable ip forward-protocol udp (ports 66 and 67)? Thanks a lot, Alex MADMAN wrote: Hmm.. I haven't done it in a while so I tried it on a 7507 with RSP8's and an MSFC2, they both accepted the command just fine but are not in the config. So I figured they must be enabled by default so I did a no ip forward protocol udp 67 and wallah, there it is!!! C7507MIX#conf t Enter configuration commands, one per line. End with CNTL/Z. C7507MIX(config)#no ip for C7507MIX(config)#no ip forward-protocol udp 67 C7507MIX(config)#^Z C7507MIX#wr t Building configuration...ip kerberos source-interface any ip classless no ip forward-protocol udp bootps Dave khramov wrote: I did that, but when I do sh run it is not showing up in config file. I mean (ip forward-protocol udp 67). Is that the way it is suppose to be? MADMAN wrote: Check ip foward protocol Dave khramov wrote: Hello How do I enable broadcast for DHCP server? I know that ip helper enables UDP broadcast, but broadcast of netbios services causes some problems for win nt server. So I guess to be more specific what can I do to forward udp broadcast on ports 67 and 68 only? And another question that I have what exactly ip directed-broadcast command does? I've searched Cisco's web site but I never came across a clear defenition? Thanks, Alex [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland CCIE# 2016 Senior Network Engineer Qwest Communications 612-664-3367 [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] groupstudy.com/form/read.php?f=7i=21133t=21051 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/lis t/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Priscilla Oppenheimer http://www.priscilla.com Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=21191t=21051 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: DHCP [7:21051]
Right on Dave! And on top of that don't forget your global config: dhcp exclude-address 2.2.2.1 2.2.2.15 (if you need some static addresses). -Original Message- From: MADMAN [mailto:[EMAIL PROTECTED]] Sent: Wednesday, September 26, 2001 1:47 PM To: [EMAIL PROTECTED] Subject: Re: DHCP [7:21051] Bravo, This makes the router a DHCP server: ip dhcp pool dave network 10.0.0.0 255.255.255.0 dns-server 172.28.2.217 172.28.2.10 default-router 10.0.0.1 Dave Tim Booth wrote: Priscilla and others: Ip dhcp-server does not turn your router into a dhcp server. It tells your router where your dhcp server is. Tim Booth - Original Message - From: Priscilla Oppenheimer To: Sent: Wednesday, September 26, 2001 12:12 PM Subject: Re: DHCP [7:21051] Why do you want to turn your router into a DHCP server? I thought you already had a DHCP server. You just need a helper address and ip forward-protocol udp 67 no ip forward-protocol 137 no ip forward-protocol 138 The last two commands are because you said that NetBIOS broadcast forwarding was causing problems for your NT server. When you have a helper address, the router forwards a bunch of UDP packets. You have to configure it to be more discerning. Priscilla At 09:24 AM 9/26/01, khramov wrote: Hello, ip dhcp-server works, I didn't specify it with a hyphen. So would you agree that the best solution for me would be to disable ip directed broadcast, ip helper address and enable ip dhcp-server at the global config? If I enable ip dhcp-server do I need to enable ip forward-protocol udp (ports 66 and 67)? Thanks a lot, Alex MADMAN wrote: Hmm.. I haven't done it in a while so I tried it on a 7507 with RSP8's and an MSFC2, they both accepted the command just fine but are not in the config. So I figured they must be enabled by default so I did a no ip forward protocol udp 67 and wallah, there it is!!! C7507MIX#conf t Enter configuration commands, one per line. End with CNTL/Z. C7507MIX(config)#no ip for C7507MIX(config)#no ip forward-protocol udp 67 C7507MIX(config)#^Z C7507MIX#wr t Building configuration...ip kerberos source-interface any ip classless no ip forward-protocol udp bootps Dave khramov wrote: I did that, but when I do sh run it is not showing up in config file. I mean (ip forward-protocol udp 67). Is that the way it is suppose to be? MADMAN wrote: Check ip foward protocol Dave khramov wrote: Hello How do I enable broadcast for DHCP server? I know that ip helper enables UDP broadcast, but broadcast of netbios services causes some problems for win nt server. So I guess to be more specific what can I do to forward udp broadcast on ports 67 and 68 only? And another question that I have what exactly ip directed-broadcast command does? I've searched Cisco's web site but I never came across a clear defenition? Thanks, Alex [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland CCIE# 2016 Senior Network Engineer Qwest Communications 612-664-3367 [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] Priscilla Oppenheimer http://www.priscilla.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=21194t=21051 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: DHCP [7:21051]
Hey Dave, forgot 1 line: ip dhcp excluded-address 10.0.0.1 Thanks Buddy! ;^) -Eric -Original Message- From: MADMAN [mailto:[EMAIL PROTECTED]] Sent: Wednesday, September 26, 2001 1:47 PM To: [EMAIL PROTECTED] Subject: Re: DHCP [7:21051] Bravo, This makes the router a DHCP server: ip dhcp pool dave network 10.0.0.0 255.255.255.0 dns-server 172.28.2.217 172.28.2.10 default-router 10.0.0.1 Dave Tim Booth wrote: Priscilla and others: Ip dhcp-server does not turn your router into a dhcp server. It tells your router where your dhcp server is. Tim Booth - Original Message - From: Priscilla Oppenheimer To: Sent: Wednesday, September 26, 2001 12:12 PM Subject: Re: DHCP [7:21051] Why do you want to turn your router into a DHCP server? I thought you already had a DHCP server. You just need a helper address and ip forward-protocol udp 67 no ip forward-protocol 137 no ip forward-protocol 138 The last two commands are because you said that NetBIOS broadcast forwarding was causing problems for your NT server. When you have a helper address, the router forwards a bunch of UDP packets. You have to configure it to be more discerning. Priscilla At 09:24 AM 9/26/01, khramov wrote: Hello, ip dhcp-server works, I didn't specify it with a hyphen. So would you agree that the best solution for me would be to disable ip directed broadcast, ip helper address and enable ip dhcp-server at the global config? If I enable ip dhcp-server do I need to enable ip forward-protocol udp (ports 66 and 67)? Thanks a lot, Alex MADMAN wrote: Hmm.. I haven't done it in a while so I tried it on a 7507 with RSP8's and an MSFC2, they both accepted the command just fine but are not in the config. So I figured they must be enabled by default so I did a no ip forward protocol udp 67 and wallah, there it is!!! C7507MIX#conf t Enter configuration commands, one per line. End with CNTL/Z. C7507MIX(config)#no ip for C7507MIX(config)#no ip forward-protocol udp 67 C7507MIX(config)#^Z C7507MIX#wr t Building configuration...ip kerberos source-interface any ip classless no ip forward-protocol udp bootps Dave khramov wrote: I did that, but when I do sh run it is not showing up in config file. I mean (ip forward-protocol udp 67). Is that the way it is suppose to be? MADMAN wrote: Check ip foward protocol Dave khramov wrote: Hello How do I enable broadcast for DHCP server? I know that ip helper enables UDP broadcast, but broadcast of netbios services causes some problems for win nt server. So I guess to be more specific what can I do to forward udp broadcast on ports 67 and 68 only? And another question that I have what exactly ip directed-broadcast command does? I've searched Cisco's web site but I never came across a clear defenition? Thanks, Alex [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland CCIE# 2016 Senior Network Engineer Qwest Communications 612-664-3367 [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] Priscilla Oppenheimer http://www.priscilla.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=21197t=21051 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: DHCP [7:21051]
OK, I'm starting to see where the confusion is coming from. The ip dhcp-server command can be used on dial-up PPP links. It specifies the IP address of a DHCP server for the PPP client to use. It was almost impossible to find in the documentation. Most of the ip dhcp commands relate to telling your router to be a DHCP server, which is a completely different solution, of course. Are you using PPP, Khramov? The general-purpose way to tell your router the address of your DHCP server is the ip helper-address command. Priscilla At 01:54 PM 9/26/01, Tim Booth wrote: Priscilla and others: Ip dhcp-server does not turn your router into a dhcp server. It tells your router where your dhcp server is. Tim Booth - Original Message - From: Priscilla Oppenheimer To: Sent: Wednesday, September 26, 2001 12:12 PM Subject: Re: DHCP [7:21051] Why do you want to turn your router into a DHCP server? I thought you already had a DHCP server. You just need a helper address and ip forward-protocol udp 67 no ip forward-protocol 137 no ip forward-protocol 138 The last two commands are because you said that NetBIOS broadcast forwarding was causing problems for your NT server. When you have a helper address, the router forwards a bunch of UDP packets. You have to configure it to be more discerning. Priscilla At 09:24 AM 9/26/01, khramov wrote: Hello, ip dhcp-server works, I didn't specify it with a hyphen. So would you agree that the best solution for me would be to disable ip directed broadcast, ip helper address and enable ip dhcp-server at the global config? If I enable ip dhcp-server do I need to enable ip forward-protocol udp (ports 66 and 67)? Thanks a lot, Alex MADMAN wrote: Hmm.. I haven't done it in a while so I tried it on a 7507 with RSP8's and an MSFC2, they both accepted the command just fine but are not in the config. So I figured they must be enabled by default so I did a no ip forward protocol udp 67 and wallah, there it is!!! C7507MIX#conf t Enter configuration commands, one per line. End with CNTL/Z. C7507MIX(config)#no ip for C7507MIX(config)#no ip forward-protocol udp 67 C7507MIX(config)#^Z C7507MIX#wr t Building configuration...ip kerberos source-interface any ip classless no ip forward-protocol udp bootps Dave khramov wrote: I did that, but when I do sh run it is not showing up in config file. I mean (ip forward-protocol udp 67). Is that the way it is suppose to be? MADMAN wrote: Check ip foward protocol Dave khramov wrote: Hello How do I enable broadcast for DHCP server? I know that ip helper enables UDP broadcast, but broadcast of netbios services causes some problems for win nt server. So I guess to be more specific what can I do to forward udp broadcast on ports 67 and 68 only? And another question that I have what exactly ip directed-broadcast command does? I've searched Cisco's web site but I never came across a clear defenition? Thanks, Alex [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland CCIE# 2016 Senior Network Engineer Qwest Communications 612-664-3367 [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] Priscilla Oppenheimer http://www.priscilla.com Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=21199t=21051 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: DHCP [7:21051]
Their must be more than one way to foreword DHCP requests. Tom got me looking into this earlier. -Eric -Original Message- From: Priscilla Oppenheimer [mailto:[EMAIL PROTECTED]] Sent: Wednesday, September 26, 2001 2:05 PM To: [EMAIL PROTECTED] Subject: Re: DHCP [7:21051] At 01:06 PM 9/26/01, khramov wrote: From my understanding ip dhcp-server command will enable upd broadcast on ports 66 and 67. Is that true? It causes your router to BE a DHCP server and to accept and process broadcasts to UDP port 67 and to send responses from port 66. It does not cause the router to forward UDP broadcasts to port 67. If you turn your router into a DHCP server, you would also have to identify an external File Transport Protocol (FTP), Trivial File Transfer Protocol (TFTP), or remote copy protocol (rcp) server that you will use to store the DHCP bindings database. The router will access that database. Here's more info on turning your router into a DHCP server, which is often not a good idea, in my opinion (because it detracts from the router's real jobs): http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fipr _c/ipcprt1/1cfdhcp.htm Priscilla Alex Priscilla Oppenheimer wrote: Why do you want to turn your router into a DHCP server? I thought you already had a DHCP server. You just need a helper address and ip forward-protocol udp 67 no ip forward-protocol 137 no ip forward-protocol 138 The last two commands are because you said that NetBIOS broadcast forwarding was causing problems for your NT server. When you have a helper address, the router forwards a bunch of UDP packets. You have to configure it to be more discerning. Priscilla At 09:24 AM 9/26/01, khramov wrote: Hello, ip dhcp-server works, I didn't specify it with a hyphen. So would you agree that the best solution for me would be to disable ip directed broadcast, ip helper address and enable ip dhcp-server at the global config? If I enable ip dhcp-server do I need to enable ip forward-protocol udp (ports 66 and 67)? Thanks a lot, Alex MADMAN wrote: Hmm.. I haven't done it in a while so I tried it on a 7507 with RSP8's and an MSFC2, they both accepted the command just fine but are not in the config. So I figured they must be enabled by default so I did a no ip forward protocol udp 67 and wallah, there it is!!! C7507MIX#conf t Enter configuration commands, one per line. End with CNTL/Z. C7507MIX(config)#no ip for C7507MIX(config)#no ip forward-protocol udp 67 C7507MIX(config)#^Z C7507MIX#wr t Building configuration...ip kerberos source-interface any ip classless no ip forward-protocol udp bootps Dave khramov wrote: I did that, but when I do sh run it is not showing up in config file. I mean (ip forward-protocol udp 67). Is that the way it is suppose to be? MADMAN wrote: Check ip foward protocol Dave khramov wrote: Hello How do I enable broadcast for DHCP server? I know that ip helper enables UDP broadcast, but broadcast of netbios services causes some problems for win nt server. So I guess to be more specific what can I do to forward udp broadcast on ports 67 and 68 only? And another question that I have what exactly ip directed-broadcast command does? I've searched Cisco's web site but I never came across a clear defenition? Thanks, Alex [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland CCIE# 2016 Senior Network Engineer Qwest Communications 612-664-3367 [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] groupstudy.com/form/read.php?f=7i=21133t=21051 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/lis t/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Priscilla Oppenheimer http://www.priscilla.com Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=21202t=21051 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: DHCP [7:21051]
Yes, I finally found that also, but only in reference to dial-up networks where the router is acting as an access sever for SLIP/PPP clients. Does it work elsewhere? It would be good if it did. Priscilla At 02:24 PM 9/26/01, [EMAIL PROTECTED] wrote: Their must be more than one way to foreword DHCP requests. http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/dial_r/drdreip.htm#xtocid1564817 Tom got me looking into this earlier. -Eric -Original Message- From: Priscilla Oppenheimer [mailto:[EMAIL PROTECTED]] Sent: Wednesday, September 26, 2001 2:05 PM To: [EMAIL PROTECTED] Subject: Re: DHCP [7:21051] At 01:06 PM 9/26/01, khramov wrote: From my understanding ip dhcp-server command will enable upd broadcast on ports 66 and 67. Is that true? It causes your router to BE a DHCP server and to accept and process broadcasts to UDP port 67 and to send responses from port 66. It does not cause the router to forward UDP broadcasts to port 67. If you turn your router into a DHCP server, you would also have to identify an external File Transport Protocol (FTP), Trivial File Transfer Protocol (TFTP), or remote copy protocol (rcp) server that you will use to store the DHCP bindings database. The router will access that database. Here's more info on turning your router into a DHCP server, which is often not a good idea, in my opinion (because it detracts from the router's real jobs): http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fipr_c/ipcprt1/1cfdhcp.htm Priscilla Alex Priscilla Oppenheimer wrote: Why do you want to turn your router into a DHCP server? I thought you already had a DHCP server. You just need a helper address and ip forward-protocol udp 67 no ip forward-protocol 137 no ip forward-protocol 138 The last two commands are because you said that NetBIOS broadcast forwarding was causing problems for your NT server. When you have a helper address, the router forwards a bunch of UDP packets. You have to configure it to be more discerning. Priscilla At 09:24 AM 9/26/01, khramov wrote: Hello, ip dhcp-server works, I didn't specify it with a hyphen. So would you agree that the best solution for me would be to disable ip directed broadcast, ip helper address and enable ip dhcp-server at the global config? If I enable ip dhcp-server do I need to enable ip forward-protocol udp (ports 66 and 67)? Thanks a lot, Alex MADMAN wrote: Hmm.. I haven't done it in a while so I tried it on a 7507 with RSP8's and an MSFC2, they both accepted the command just fine but are not in the config. So I figured they must be enabled by default so I did a no ip forward protocol udp 67 and wallah, there it is!!! C7507MIX#conf t Enter configuration commands, one per line. End with CNTL/Z. C7507MIX(config)#no ip for C7507MIX(config)#no ip forward-protocol udp 67 C7507MIX(config)#^Z C7507MIX#wr t Building configuration...ip kerberos source-interface any ip classless no ip forward-protocol udp bootps Dave khramov wrote: I did that, but when I do sh run it is not showing up in config file. I mean (ip forward-protocol udp 67). Is that the way it is suppose to be? MADMAN wrote: Check ip foward protocol Dave khramov wrote: Hello How do I enable broadcast for DHCP server? I know that ip helper enables UDP broadcast, but broadcast of netbios services causes some problems for win nt server. So I guess to be more specific what can I do to forward udp broadcast on ports 67 and 68 only? And another question that I have what exactly ip directed-broadcast command does? I've searched Cisco's web site but I never came across a clear defenition? Thanks, Alex [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland CCIE# 2016 Senior Network Engineer Qwest Communications 612-664-3367 [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] groupstudy.com/form/read.php?f=7i=21133t=21051 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/lis t/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED
Re: DHCP [7:21051]
Priscilla, I think that you are right about the ip dhcp-server command. I looked it up on Cisco's web site. It seems that it can be used only with dial up to tell the client where dhcp server is. Priscilla Oppenheimer wrote: Yes, I finally found that also, but only in reference to dial-up networks where the router is acting as an access sever for SLIP/PPP clients. Does it work elsewhere? It would be good if it did. Priscilla At 02:24 PM 9/26/01, [EMAIL PROTECTED] wrote: Their must be more than one way to foreword DHCP requests. http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/dial_r/drdreip.htm#xtocid1564817 Tom got me looking into this earlier. -Eric -Original Message- From: Priscilla Oppenheimer [mailto:[EMAIL PROTECTED]] Sent: Wednesday, September 26, 2001 2:05 PM To: [EMAIL PROTECTED] Subject: Re: DHCP [7:21051] At 01:06 PM 9/26/01, khramov wrote: From my understanding ip dhcp-server command will enable upd broadcast on ports 66 and 67. Is that true? It causes your router to BE a DHCP server and to accept and process broadcasts to UDP port 67 and to send responses from port 66. It does not cause the router to forward UDP broadcasts to port 67. If you turn your router into a DHCP server, you would also have to identify an external File Transport Protocol (FTP), Trivial File Transfer Protocol (TFTP), or remote copy protocol (rcp) server that you will use to store the DHCP bindings database. The router will access that database. Here's more info on turning your router into a DHCP server, which is often not a good idea, in my opinion (because it detracts from the router's real jobs): http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fipr_c/ipcprt1/1cfdhcp.htm Priscilla Alex Priscilla Oppenheimer wrote: Why do you want to turn your router into a DHCP server? I thought you already had a DHCP server. You just need a helper address and ip forward-protocol udp 67 no ip forward-protocol 137 no ip forward-protocol 138 The last two commands are because you said that NetBIOS broadcast forwarding was causing problems for your NT server. When you have a helper address, the router forwards a bunch of UDP packets. You have to configure it to be more discerning. Priscilla At 09:24 AM 9/26/01, khramov wrote: Hello, ip dhcp-server works, I didn't specify it with a hyphen. So would you agree that the best solution for me would be to disable ip directed broadcast, ip helper address and enable ip dhcp-server at the global config? If I enable ip dhcp-server do I need to enable ip forward-protocol udp (ports 66 and 67)? Thanks a lot, Alex MADMAN wrote: Hmm.. I haven't done it in a while so I tried it on a 7507 with RSP8's and an MSFC2, they both accepted the command just fine but are not in the config. So I figured they must be enabled by default so I did a no ip forward protocol udp 67 and wallah, there it is!!! C7507MIX#conf t Enter configuration commands, one per line. End with CNTL/Z. C7507MIX(config)#no ip for C7507MIX(config)#no ip forward-protocol udp 67 C7507MIX(config)#^Z C7507MIX#wr t Building configuration...ip kerberos source-interface any ip classless no ip forward-protocol udp bootps Dave khramov wrote: I did that, but when I do sh run it is not showing up in config file. I mean (ip forward-protocol udp 67). Is that the way it is suppose to be? MADMAN wrote: Check ip foward protocol Dave khramov wrote: Hello How do I enable broadcast for DHCP server? I know that ip helper enables UDP broadcast, but broadcast of netbios services causes some problems for win nt server. So I guess to be more specific what can I do to forward udp broadcast on ports 67 and 68 only? And another question that I have what exactly ip directed-broadcast command does? I've searched Cisco's web site but I never came across a clear defenition? Thanks, Alex [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland CCIE# 2016 Senior Network Engineer Qwest Communications 612
RE: DHCP [7:21051]
Try this again. http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/dial _r/drdreip.htm#xtocid1564817 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] Sent: Wednesday, September 26, 2001 2:40 PM To: [EMAIL PROTECTED] Subject: RE: DHCP [7:21051] Their must be more than one way to foreword DHCP requests. Tom got me looking into this earlier. -Eric -Original Message- From: Priscilla Oppenheimer [mailto:[EMAIL PROTECTED]] Sent: Wednesday, September 26, 2001 2:05 PM To: [EMAIL PROTECTED] Subject: Re: DHCP [7:21051] At 01:06 PM 9/26/01, khramov wrote: From my understanding ip dhcp-server command will enable upd broadcast on ports 66 and 67. Is that true? It causes your router to BE a DHCP server and to accept and process broadcasts to UDP port 67 and to send responses from port 66. It does not cause the router to forward UDP broadcasts to port 67. If you turn your router into a DHCP server, you would also have to identify an external File Transport Protocol (FTP), Trivial File Transfer Protocol (TFTP), or remote copy protocol (rcp) server that you will use to store the DHCP bindings database. The router will access that database. Here's more info on turning your router into a DHCP server, which is often not a good idea, in my opinion (because it detracts from the router's real jobs): http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fipr _c/ipcprt1/1cfdhcp.htm Priscilla Alex Priscilla Oppenheimer wrote: Why do you want to turn your router into a DHCP server? I thought you already had a DHCP server. You just need a helper address and ip forward-protocol udp 67 no ip forward-protocol 137 no ip forward-protocol 138 The last two commands are because you said that NetBIOS broadcast forwarding was causing problems for your NT server. When you have a helper address, the router forwards a bunch of UDP packets. You have to configure it to be more discerning. Priscilla At 09:24 AM 9/26/01, khramov wrote: Hello, ip dhcp-server works, I didn't specify it with a hyphen. So would you agree that the best solution for me would be to disable ip directed broadcast, ip helper address and enable ip dhcp-server at the global config? If I enable ip dhcp-server do I need to enable ip forward-protocol udp (ports 66 and 67)? Thanks a lot, Alex MADMAN wrote: Hmm.. I haven't done it in a while so I tried it on a 7507 with RSP8's and an MSFC2, they both accepted the command just fine but are not in the config. So I figured they must be enabled by default so I did a no ip forward protocol udp 67 and wallah, there it is!!! C7507MIX#conf t Enter configuration commands, one per line. End with CNTL/Z. C7507MIX(config)#no ip for C7507MIX(config)#no ip forward-protocol udp 67 C7507MIX(config)#^Z C7507MIX#wr t Building configuration...ip kerberos source-interface any ip classless no ip forward-protocol udp bootps Dave khramov wrote: I did that, but when I do sh run it is not showing up in config file. I mean (ip forward-protocol udp 67). Is that the way it is suppose to be? MADMAN wrote: Check ip foward protocol Dave khramov wrote: Hello How do I enable broadcast for DHCP server? I know that ip helper enables UDP broadcast, but broadcast of netbios services causes some problems for win nt server. So I guess to be more specific what can I do to forward udp broadcast on ports 67 and 68 only? And another question that I have what exactly ip directed-broadcast command does? I've searched Cisco's web site but I never came across a clear defenition? Thanks, Alex [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland CCIE# 2016 Senior Network Engineer Qwest Communications 612-664-3367 [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] groupstudy.com/form/read.php?f=7i=21133t=21051 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/lis t/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Priscilla Oppenheimer http://www.priscilla.com Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http
Re: DHCP [7:21051]
I am currently using this command on many routers ranging in ios from 10.2 (yeah I know but its a couple a hundred miles away) to 12.2. Without it our customers (we are an ISP) cannot reach the DHCP servers. It must work outside of the dialup only arena. At 01:09 PM 9/26/2001, khramov wrote: Priscilla, I think that you are right about the ip dhcp-server command. I looked it up on Cisco's web site. It seems that it can be used only with dial up to tell the client where dhcp server is. Priscilla Oppenheimer wrote: Yes, I finally found that also, but only in reference to dial-up networks where the router is acting as an access sever for SLIP/PPP clients. Does it work elsewhere? It would be good if it did. Priscilla At 02:24 PM 9/26/01, [EMAIL PROTECTED] wrote: Their must be more than one way to foreword DHCP requests. http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/d ial_r/drdreip.htm#xtocid1564817 Tom got me looking into this earlier. -Eric -Original Message- From: Priscilla Oppenheimer [mailto:[EMAIL PROTECTED]] Sent: Wednesday, September 26, 2001 2:05 PM To: [EMAIL PROTECTED] Subject: Re: DHCP [7:21051] At 01:06 PM 9/26/01, khramov wrote: From my understanding ip dhcp-server command will enable upd broadcast on ports 66 and 67. Is that true? It causes your router to BE a DHCP server and to accept and process broadcasts to UDP port 67 and to send responses from port 66. It does not cause the router to forward UDP broadcasts to port 67. If you turn your router into a DHCP server, you would also have to identify an external File Transport Protocol (FTP), Trivial File Transfer Protocol (TFTP), or remote copy protocol (rcp) server that you will use to store the DHCP bindings database. The router will access that database. Here's more info on turning your router into a DHCP server, which is often not a good idea, in my opinion (because it detracts from the router's real jobs): http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/f ipr_c/ipcprt1/1cfdhcp.htm Priscilla Alex Priscilla Oppenheimer wrote: Why do you want to turn your router into a DHCP server? I thought you already had a DHCP server. You just need a helper address and ip forward-protocol udp 67 no ip forward-protocol 137 no ip forward-protocol 138 The last two commands are because you said that NetBIOS broadcast forwarding was causing problems for your NT server. When you have a helper address, the router forwards a bunch of UDP packets. You have to configure it to be more discerning. Priscilla At 09:24 AM 9/26/01, khramov wrote: Hello, ip dhcp-server works, I didn't specify it with a hyphen. So would you agree that the best solution for me would be to disable ip directed broadcast, ip helper address and enable ip dhcp-server at the global config? If I enable ip dhcp-server do I need to enable ip forward-protocol udp (ports 66 and 67)? Thanks a lot, Alex MADMAN wrote: Hmm.. I haven't done it in a while so I tried it on a 7507 with RSP8's and an MSFC2, they both accepted the command just fine but are not in the config. So I figured they must be enabled by default so I did a no ip forward protocol udp 67 and wallah, there it is!!! C7507MIX#conf t Enter configuration commands, one per line. End with CNTL/Z. C7507MIX(config)#no ip for C7507MIX(config)#no ip forward-protocol udp 67 C7507MIX(config)#^Z C7507MIX#wr t Building configuration...ip kerberos source-interface any ip classless no ip forward-protocol udp bootps Dave khramov wrote: I did that, but when I do sh run it is not showing up in config file. I mean (ip forward-protocol udp 67). Is that the way it is suppose to be? MADMAN wrote: Check ip foward protocol Dave khramov wrote: Hello How do I enable broadcast for DHCP server? I know that ip helper enables UDP broadcast, but broadcast of netbios services causes some problems for win nt server. So I guess to be more specific what can I do to forward udp broadcast on ports 67 and 68 only? And another question that I have what exactly ip directed-broadcast command does? I've searched Cisco's web site but I never came across a clear defenition? Thanks, Alex [GroupStudy.com removed an attachment of type text/x-vcard which had a name
Re: DHCP [7:21051]
NetBIOS (TCP/IP) Node Type Requested Option: 47 NetBIOS (TCP/IP) Scope Requested Option: 43 Vendor Specific Information Requested Option: 77 User Class Information DHCP Option End Option Code:255 End Extra bytes (Padding): ... 00 00 00 00 00 00 00 00 00 00 00 Frame Check Sequence: 0x Priscilla At 05:12 PM 9/26/01, Wayne Wenthin wrote: I am currently using this command on many routers ranging in ios from 10.2 (yeah I know but its a couple a hundred miles away) to 12.2. Without it our customers (we are an ISP) cannot reach the DHCP servers. It must work outside of the dialup only arena. At 01:09 PM 9/26/2001, khramov wrote: Priscilla, I think that you are right about the ip dhcp-server command. I looked it up on Cisco's web site. It seems that it can be used only with dial up to tell the client where dhcp server is. Priscilla Oppenheimer wrote: Yes, I finally found that also, but only in reference to dial-up networks where the router is acting as an access sever for SLIP/PPP clients. Does it work elsewhere? It would be good if it did. Priscilla At 02:24 PM 9/26/01, [EMAIL PROTECTED] wrote: Their must be more than one way to foreword DHCP requests. http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/d ial_r/drdreip.htm#xtocid1564817 Tom got me looking into this earlier. -Eric -Original Message- From: Priscilla Oppenheimer [mailto:[EMAIL PROTECTED]] Sent: Wednesday, September 26, 2001 2:05 PM To: [EMAIL PROTECTED] Subject: Re: DHCP [7:21051] At 01:06 PM 9/26/01, khramov wrote: From my understanding ip dhcp-server command will enable upd broadcast on ports 66 and 67. Is that true? It causes your router to BE a DHCP server and to accept and process broadcasts to UDP port 67 and to send responses from port 66. It does not cause the router to forward UDP broadcasts to port 67. If you turn your router into a DHCP server, you would also have to identify an external File Transport Protocol (FTP), Trivial File Transfer Protocol (TFTP), or remote copy protocol (rcp) server that you will use to store the DHCP bindings database. The router will access that database. Here's more info on turning your router into a DHCP server, which is often not a good idea, in my opinion (because it detracts from the router's real jobs): http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/f ipr_c/ipcprt1/1cfdhcp.htm Priscilla Alex Priscilla Oppenheimer wrote: Why do you want to turn your router into a DHCP server? I thought you already had a DHCP server. You just need a helper address and ip forward-protocol udp 67 no ip forward-protocol 137 no ip forward-protocol 138 The last two commands are because you said that NetBIOS broadcast forwarding was causing problems for your NT server. When you have a helper address, the router forwards a bunch of UDP packets. You have to configure it to be more discerning. Priscilla At 09:24 AM 9/26/01, khramov wrote: Hello, ip dhcp-server works, I didn't specify it with a hyphen. So would you agree that the best solution for me would be to disable ip directed broadcast, ip helper address and enable ip dhcp-server at the global config? If I enable ip dhcp-server do I need to enable ip forward-protocol udp (ports 66 and 67)? Thanks a lot, Alex MADMAN wrote: Hmm.. I haven't done it in a while so I tried it on a 7507 with RSP8's and an MSFC2, they both accepted the command just fine but are not in the config. So I figured they must be enabled by default so I did a no ip forward protocol udp 67 and wallah, there it is!!! C7507MIX#conf t Enter configuration commands, one per line. End with CNTL/Z. C7507MIX(config)#no ip for C7507MIX(config)#no ip forward-protocol udp 67 C7507MIX(config)#^Z C7507MIX#wr t Building configuration...ip kerberos source-interface any ip classless no ip forward-protocol udp bootps Dave khramov wrote: I did that, but when I do sh run it is not showing up in config file. I mean (ip forward-protocol udp 67). Is that the way it is suppose to be? MADMAN wrote: Check ip foward protocol Dave khramov wrote: Hello How do I enable broadcast for DHCP server? I know that ip helper enables UDP broadcast, but broadcast of netbios services causes
Re: DHCP [7:21051]
Yeah I always thought the helper address command was the way to get a whole bunch of nonroutable junk forwarded. Bri - Original Message - From: Priscilla Oppenheimer To: Sent: Wednesday, September 26, 2001 4:03 PM Subject: Re: DHCP [7:21051] OK, so I tried it. The ip dhcp-server command didn't do anything on my network, which is mostly Ethernet LANs. What good is it? ;-) I had to use ip helper-address on the interface where the client resides. With that command, the DHCP messages got forwarded, whether I had ip dhcp-sever configured or not. Using just ip dhcp-server without the ip helper-address did not work, however. In that case, the DHCP messages did not get forwarded. Here's my config. The client is on the 36.1.1.0 network. I was sitting with my EtherPeek protocol analyzer on the 10.10.0.0 network. I could see the DHCP Discover come through to 10.10.0.1 whether I used ip dhcp-server 10.10.0.1 or not, as long as I did use ip helper-address 10.10.0.1. charlotte#s run Building configuration... Current configuration: ! version 11.0 service udp-small-servers service tcp-small-servers ! hostname charlotte ! enable password ! ip dhcp-server 10.10.0.1 (also tried it without this) ! interface Ethernet0 ip address 10.10.0.2 255.255.255.0 ! interface Ethernet1 ip address 36.1.1.1 255.255.255.0 ip helper-address 10.10.0.1 (this is what really did the trick) ! interface Serial0 ip address 192.168.40.2 255.255.255.0 no fair-queue ! interface Serial1 no ip address shutdown ! interface TokenRing1 no ip address shutdown ! interface TokenRing0 no ip address shutdown ! router ospf 100 network 192.168.0.0 0.0.255.255 area 2 network 10.10.0.0 0.0.255.255 area 0 network 36.1.1.0 0.0.0.255 area 2 ! line con 0 line aux 0 transport input all line vty 0 4 password cisco login ! end The DHCP Discover from the client that I captured might be informative for people learning about how DHCP Relay works. Notice that the packet is a unicast, rather than a broadcast. Also, notice at the IP layer that the source address is the router, not the client's 0.0.0.0 address that you normally see with DHCP. The router also put its address in the DHCP server under Gateway IP Address. The DHCP server needs to see this to know which subnet the client's request came from. Ethernet Header Destination: 00:00:0C:05:3E:80 Source: 00:00:0C:00:2E:75 Protocol Type:0x0800 IP IP Header - Internet Protocol Datagram Version: 4 Header Length:5 (20 bytes) Type of Service: % Precedence: Routine, Normal Delay, Normal Throughput, Normal Reliability Total Length: 328 Identifier: 12800 Fragmentation Flags: %000 May Fragment Last Fragment Fragment Offset: 0 (0 bytes) Time To Live: 127 Protocol: 17 UDP Header Checksum: 0xD998 Source IP Address:36.1.1.1 Dest. IP Address: 10.10.0.1 No IP Options UDP - User Datagram Protocol Source Port: 68 Bootstrap (BOOTP Client) Destination Port: 67 Bootstrap Protocol Server Length: 308 Checksum: 0x3159 BootP - Bootstrap Protocol Operation:1 Boot Request Hardware Address Type:1 Ethernet (10Mb) Hardware Address Length: 6 bytes Hops: 0 Transaction ID: 678970121 Seconds Since Boot Start: 0 Flags:0x IP Address Known By Client: 0.0.0.0 IP Address Not Known By Client Client IP Addr Given By Srvr: 0.0.0.0 Server IP Address:0.0.0.0 Gateway IP Address: 36.1.1.1 Client Hardware Address: 00:E0:98:89:52:FA Unused: 0x Server Host Name: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 Boot File Name: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 DHCP - Dynamic Host Configuration Protocol DHCP Magic Cookie:0x63825363 Message TypeDHCP Option Option Code:53 Message Type Option Length: 1 Message Type: 1 Discover Client IdentifierDHCP Option Option Code:61 Client Identifier Option Length: 7 Hardware Type: 1 Hardware Address: 00:E0:98:89:52:FA Requested IP AddressDHCP Option Option Code:50 Requested IP Address Option Length: 4 Address:36.1.1.2 Host Name AddressDHCP Option Option Code:12 Host Name Address Option Length: 8 String: MACTEAM. Vendor Class IdentifierDHCP Option Option Code:60 Vendor Class Identifier Option Length: 7 Option Data: MSFT 98 4D 53
Re: DHCP [7:21051]
At 05:14 PM 9/26/01, Brian wrote: Yeah I always thought the helper address command was the way to get a whole bunch of nonroutable junk forwarded. It gets a bunch of UDP broadcasts forwarded. I figured out the ip dhcp-server command. It's not a replacement for ip helper-address. It's for access servers. It's only documented in access server documentation and documentation for the Gateway General Packet Radio Service (GPRS) Support Node (GGSN), whatever that is. The GGSN provides services to wireless devices, that much I know, and it's sort of an access server for the purposes of this discussion. So dial-up users, wireless users, etc. reach the Internet or corporate intranet through the access server. With ip dhcp-server you can make sure the access server gives these users an IP address because it forwards their requests (or asks on its own) to a DHCP server. Note that if the DHCP server is not on the same LAN as the access server, then you need to configure ip helper-address on intermediate routers between the access server and DHCP server. ip helper-address is also used for the more common situations, for example, when clients are on a different LAN than the DHCP server. ip dhcp-server didn't work in this case, per my previous message. I'd love to hear any more uses for ip dhcp-server if they exist. I would think that access server could also mean a DSL or cable modem router, but I don't see any evidence of the ip dhcp-server command being documented for those environments. (The command definitely doesn't turn the router into a DHCP server a I originally said, sorry. I feel sort of justified for that mistake, though since the other ip dhcp commands do that. ;-) Priscilla Bri Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=21238t=21051 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: DHCP [7:21051]
i remember the only command i ut on the cisco router is peer default ip address dhcp and enable the ip helper address -Original Message- From: Priscilla Oppenheimer [mailto:[EMAIL PROTECTED]] Sent: Wednesday, September 26, 2001 11:28 PM To: [EMAIL PROTECTED] Subject: Re: DHCP [7:21051] OK, I'm starting to see where the confusion is coming from. The ip dhcp-server command can be used on dial-up PPP links. It specifies the IP address of a DHCP server for the PPP client to use. It was almost impossible to find in the documentation. Most of the ip dhcp commands relate to telling your router to be a DHCP server, which is a completely different solution, of course. Are you using PPP, Khramov? The general-purpose way to tell your router the address of your DHCP server is the ip helper-address command. Priscilla At 01:54 PM 9/26/01, Tim Booth wrote: Priscilla and others: Ip dhcp-server does not turn your router into a dhcp server. It tells your router where your dhcp server is. Tim Booth - Original Message - From: Priscilla Oppenheimer To: Sent: Wednesday, September 26, 2001 12:12 PM Subject: Re: DHCP [7:21051] Why do you want to turn your router into a DHCP server? I thought you already had a DHCP server. You just need a helper address and ip forward-protocol udp 67 no ip forward-protocol 137 no ip forward-protocol 138 The last two commands are because you said that NetBIOS broadcast forwarding was causing problems for your NT server. When you have a helper address, the router forwards a bunch of UDP packets. You have to configure it to be more discerning. Priscilla At 09:24 AM 9/26/01, khramov wrote: Hello, ip dhcp-server works, I didn't specify it with a hyphen. So would you agree that the best solution for me would be to disable ip directed broadcast, ip helper address and enable ip dhcp-server at the global config? If I enable ip dhcp-server do I need to enable ip forward-protocol udp (ports 66 and 67)? Thanks a lot, Alex MADMAN wrote: Hmm.. I haven't done it in a while so I tried it on a 7507 with RSP8's and an MSFC2, they both accepted the command just fine but are not in the config. So I figured they must be enabled by default so I did a no ip forward protocol udp 67 and wallah, there it is!!! C7507MIX#conf t Enter configuration commands, one per line. End with CNTL/Z. C7507MIX(config)#no ip for C7507MIX(config)#no ip forward-protocol udp 67 C7507MIX(config)#^Z C7507MIX#wr t Building configuration...ip kerberos source-interface any ip classless no ip forward-protocol udp bootps Dave khramov wrote: I did that, but when I do sh run it is not showing up in config file. I mean (ip forward-protocol udp 67). Is that the way it is suppose to be? MADMAN wrote: Check ip foward protocol Dave khramov wrote: Hello How do I enable broadcast for DHCP server? I know that ip helper enables UDP broadcast, but broadcast of netbios services causes some problems for win nt server. So I guess to be more specific what can I do to forward udp broadcast on ports 67 and 68 only? And another question that I have what exactly ip directed-broadcast command does? I've searched Cisco's web site but I never came across a clear defenition? Thanks, Alex [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland CCIE# 2016 Senior Network Engineer Qwest Communications 612-664-3367 [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] Priscilla Oppenheimer http://www.priscilla.com Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=21256t=21051 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: DHCP [7:21051]
First Question answer: c3640A(config)#ip forward-protocol udp ? Port number biff Biff (mail notification, comsat, 512) bootpc Bootstrap Protocol (BOOTP) client (68) bootps Bootstrap Protocol (BOOTP) server (67) discard Discard (9) dnsixDNSIX security protocol auditing (195) domain Domain Name Service (DNS, 53) echo Echo (7) isakmp Internet Security Association and Key Management Protocol (500) mobile-ipMobile IP registration (434) nameserver IEN116 name service (obsolete, 42) netbios-dgm NetBios datagram service (138) netbios-ns NetBios name service (137) netbios-ss NetBios session service (139) ntp Network Time Protocol (123) pim-auto-rp PIM Auto-RP (496) rip Routing Information Protocol (router, in.routed, 520) snmp Simple Network Management Protocol (161) snmptrap SNMP Traps (162) sunrpc Sun Remote Procedure Call (111) syslog System Logger (514) tacacs TAC Access Control System (49) talk Talk (517) tftp Trivial File Transfer Protocol (69) time Time (37) who Who service (rwho, 513) xdmcpX Display Manager Control Protocol (177) Second answer: The way I understand the command, and please correct me if I am wrong, is as follows. It forwards subnet broadcasts to a destination network in a unicast format and once the unicast packet is received on the destination network it is then sent out as a broadcast. I think that is what it does. Thanks, Eric -Original Message- From: khramov [mailto:[EMAIL PROTECTED]] Sent: Tuesday, September 25, 2001 2:58 PM To: [EMAIL PROTECTED] Subject: DHCP [7:21051] Hello How do I enable broadcast for DHCP server? I know that ip helper enables UDP broadcast, but broadcast of netbios services causes some problems for win nt server. So I guess to be more specific what can I do to forward udp broadcast on ports 67 and 68 only? And another question that I have what exactly ip directed-broadcast command does? I've searched Cisco's web site but I never came across a clear defenition? Thanks, Alex [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=21058t=21051 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: DHCP [7:21051]
Check ip foward protocol Dave khramov wrote: Hello How do I enable broadcast for DHCP server? I know that ip helper enables UDP broadcast, but broadcast of netbios services causes some problems for win nt server. So I guess to be more specific what can I do to forward udp broadcast on ports 67 and 68 only? And another question that I have what exactly ip directed-broadcast command does? I've searched Cisco's web site but I never came across a clear defenition? Thanks, Alex [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- 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=21072t=21051 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: DHCP [7:21051]
I did that, but when I do sh run it is not showing up in config file. I mean (ip forward-protocol udp 67). Is that the way it is suppose to be? MADMAN wrote: Check ip foward protocol Dave khramov wrote: Hello How do I enable broadcast for DHCP server? I know that ip helper enables UDP broadcast, but broadcast of netbios services causes some problems for win nt server. So I guess to be more specific what can I do to forward udp broadcast on ports 67 and 68 only? And another question that I have what exactly ip directed-broadcast command does? I've searched Cisco's web site but I never came across a clear defenition? Thanks, Alex [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=21075t=21051 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: DHCP [7:21051]
Alex, Ip dhcp server [address | name] will solve your problems (IOS 11.0 and later). As far as the problems you're having with the NETBEUI traffic and ip helper, you need to make sure you have protocol forwarding enabled, and transparent or source-route bridging properly configured aka UDP flooding. This solution is much more lengthy and cumbersome than the ip dhcp server command for dhcp broadcast forwarding. As I found on the cisco site, with ip directed-broadcast the only protocols that are forwarded are those that are specified with the ip forward-protocol command. By default (IOS 12.0 and later), ip directed-broadcast is disabled, and all directed ip broadcasts are dropped. This command translates from directed broadcasts to physical broadcasts. I think what is meant by a directed broadcast is a subnet (or possibly multicast?) and a physical broadcast is meant as 255.255.255.255, and would be forwarded out all interfaces (?). Hope this helps, Tim Booth - Original Message - From: khramov To: Sent: Tuesday, September 25, 2001 2:57 PM Subject: DHCP [7:21051] Hello How do I enable broadcast for DHCP server? I know that ip helper enables UDP broadcast, but broadcast of netbios services causes some problems for win nt server. So I guess to be more specific what can I do to forward udp broadcast on ports 67 and 68 only? And another question that I have what exactly ip directed-broadcast command does? I've searched Cisco's web site but I never came across a clear defenition? Thanks, Alex Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=21077t=21051 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: DHCP [7:21051]
I am running 12.1 and I do not have a ip dhcp server (address). Are you suggesting to configure my router as a DHCP server? No, we have a win nt dhcp server running. Our win nt servers are reciving a lot of broadcasts because of some kind of election for a master browser (NT thing). That means that our routers are passing unnessary broadcast. I tried to specify broadcasts only for port 66 and 67 (dhcp ports ) but it is not showing up in my config, it could be enable by default. Here is a copy of config on my router: ! Last configuration change at 16:27:46 cdt Tue Sep 25 2001 ! NVRAM config last updated at 16:27:48 cdt Tue Sep 25 2001 ! version 12.1 service timestamps debug uptime service timestamps log uptime service password-encryption clock timezone cst -6 clock summer-time cdt recurring ip subnet-zero ip cef ip domain-name nsuok.edu ip name-server 192.78.4.156 ip name-server 192.78.4.158 ! ! ! ! interface Vlan1 description (vlan 1) Management Vlan ip address 172.16.1.1 255.255.0.0 ip helper-address 192.173.45.15 ip directed-broadcast ! interface Vlan2 description A ip address 172.17.1.1 255.255.0.0 ip helper-address 192.173.45.15 ip directed-broadcast ! interface Vlan3 description B ip address 172.18.1.1 255.255.0.0 ip helper-address 192.173.45.15 ip directed-broadcast ! interface Vlan4 description C ip address 172.19.1.1 255.255.0.0 ip helper-address 192.78.4.47 ip directed-broadcast ! Tim Booth wrote: Alex, Ip dhcp server [address | name] will solve your problems (IOS 11.0 and later). As far as the problems you're having with the NETBEUI traffic and ip helper, you need to make sure you have protocol forwarding enabled, and transparent or source-route bridging properly configured aka UDP flooding. This solution is much more lengthy and cumbersome than the ip dhcp server command for dhcp broadcast forwarding. As I found on the cisco site, with ip directed-broadcast the only protocols that are forwarded are those that are specified with the ip forward-protocol command. By default (IOS 12.0 and later), ip directed-broadcast is disabled, and all directed ip broadcasts are dropped. This command translates from directed broadcasts to physical broadcasts. I think what is meant by a directed broadcast is a subnet (or possibly multicast?) and a physical broadcast is meant as 255.255.255.255, and would be forwarded out all interfaces (?). Hope this helps, Tim Booth - Original Message - From: khramov To: Sent: Tuesday, September 25, 2001 2:57 PM Subject: DHCP [7:21051] Hello How do I enable broadcast for DHCP server? I know that ip helper enables UDP broadcast, but broadcast of netbios services causes some problems for win nt server. So I guess to be more specific what can I do to forward udp broadcast on ports 67 and 68 only? And another question that I have what exactly ip directed-broadcast command does? I've searched Cisco's web site but I never came across a clear defenition? Thanks, Alex [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=21082t=21051 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: DHCP [7:21051]
You have to also do no ip forward-protocol for all the ones that you don't want forwarded. Cisco doesn't make it easy for you! ;-) Priscilla At 06:18 PM 9/25/01, khramov wrote: I did that, but when I do sh run it is not showing up in config file. I mean (ip forward-protocol udp 67). Is that the way it is suppose to be? MADMAN wrote: Check ip foward protocol Dave khramov wrote: Hello How do I enable broadcast for DHCP server? I know that ip helper enables UDP broadcast, but broadcast of netbios services causes some problems for win nt server. So I guess to be more specific what can I do to forward udp broadcast on ports 67 and 68 only? And another question that I have what exactly ip directed-broadcast command does? I've searched Cisco's web site but I never came across a clear defenition? Thanks, Alex [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=21083t=21051 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: DHCP [7:21051]
Hmm.. I haven't done it in a while so I tried it on a 7507 with RSP8's and an MSFC2, they both accepted the command just fine but are not in the config. So I figured they must be enabled by default so I did a no ip forward protocol udp 67 and wallah, there it is!!! C7507MIX#conf t Enter configuration commands, one per line. End with CNTL/Z. C7507MIX(config)#no ip for C7507MIX(config)#no ip forward-protocol udp 67 C7507MIX(config)#^Z C7507MIX#wr t Building configuration...ip kerberos source-interface any ip classless no ip forward-protocol udp bootps Dave khramov wrote: I did that, but when I do sh run it is not showing up in config file. I mean (ip forward-protocol udp 67). Is that the way it is suppose to be? MADMAN wrote: Check ip foward protocol Dave khramov wrote: Hello How do I enable broadcast for DHCP server? I know that ip helper enables UDP broadcast, but broadcast of netbios services causes some problems for win nt server. So I guess to be more specific what can I do to forward udp broadcast on ports 67 and 68 only? And another question that I have what exactly ip directed-broadcast command does? I've searched Cisco's web site but I never came across a clear defenition? Thanks, Alex [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it [GroupStudy.com removed an attachment of type text/x-vcard which had a name of khramov.vcf] -- David Madland CCIE# 2016 Senior Network Engineer Qwest Communications 612-664-3367 Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=21093t=21051 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
