[52580] in North American Network Operators' Group
iBGP next hop and multi-access media
daemon@ATHENA.MIT.EDU (Ralph Doncaster)
Sun Oct 6 12:43:13 2002
Date: Sun, 6 Oct 2002 12:44:07 -0400 (EDT)
From: Ralph Doncaster <ralph@istop.com>
To: nanog@merit.edu
Errors-To: owner-nanog-outgoing@merit.edu
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
