nanog mailing list archives
Re: iBGP next hop and multi-access media
From: "John M. Brown" <john () chagresventures com>
Date: Tue, 8 Oct 2002 06:59:35 -0700
Let me see if I got this. Route A: unknown networks behind it uses 10.10.10.2 as a neighbor to router B Router B: has a network 172.16.16/24 uses 10.10.10.1 as a neighbor to router A. Router A's table shows 172.16.16/24 -> 10.10.10.2 You want Router A to ARP and pretend its on the local broadcast domain for the 172.16.16/24 prefix. But that prefix is NOT local to router A, thus it must ROUTE and thus uses the NexHop in its table. It seems you description is wrong.... But I don't know.. Please clarify On Sun, Oct 06, 2002 at 12:44:07PM -0400, Ralph Doncaster wrote:
Background: Router A and B are connected via a common ethernet segment 1. Router A uses 10.10.10.1/30, and Router B uses 10.10.10.2/30. Router B also has another subnet configured for ethernet segment 1; 172.16.16.0/24. When I setup a situation like the above, with Router B advertising the 172.16.16.0/24 to router A, router A sees a next hop of 10.10.10.2. This is not good since packets from A going to the 172.16.16 subnet get sent to Router B, which then ARPs the desitnation, instead of just being ARPed by router A. I don't want to turn on ICMP redirects on B since they're insecure and ugly. I've also made sure I'm not using next-hop self. Is there a way to make this work? Ralph Doncaster principal, IStop.com
Current thread:
- Re: iBGP next hop and multi-access media, (continued)
- Re: iBGP next hop and multi-access media alex (Oct 07)
- Re: iBGP next hop and multi-access media Jared Mauch (Oct 06)
- Re: iBGP next hop and multi-access media Stephen J. Wilcox (Oct 07)
- Re: iBGP next hop and multi-access media Petri Helenius (Oct 11)
- Re: iBGP next hop and multi-access media alex (Oct 07)
- Re: iBGP next hop and multi-access media jlewis (Oct 07)
- Re: iBGP next hop and multi-access media Majdi S. Abbas (Oct 07)
- Re: iBGP next hop and multi-access media Ralph Doncaster (Oct 07)
- Re: iBGP next hop and multi-access media Peter E. Fry (Oct 07)
- Re: iBGP next hop and multi-access media Pete Templin (Oct 07)
- Re: iBGP next hop and multi-access media Mark Kent (Oct 06)
- Re: iBGP next hop and multi-access media Gregory Urban (Oct 08)
- Re: iBGP next hop and multi-access media Clayton Fiske (Oct 06)
- Re: iBGP next hop and multi-access media Ralph Doncaster (Oct 07)
- Re: iBGP next hop and multi-access media Stephen J. Wilcox (Oct 06)
- Re: iBGP next hop and multi-access media alex (Oct 07)
- Re: iBGP next hop and multi-access media John M. Brown (Oct 08)