🚀 go-pugleaf

I have a network with several ciscos on it:

      |            |            |
      +---- R1 ----+            |
      |            +---- R2 ----+
      |            |            |

    net A       net B        net C

The routers speak IGRP amongst themselves, and redistribute IGRP into
RIP for the benefit of hosts which don't understand anything else.
(The network is actually rather more complicated; I'm simplifying to
illustrate the problem.)  Another router on net A is a gateway to the
Internet, which R1 and R2 learn about via IGRP and then redistribute
to RIP as default routes.

The problem is that R2 advertises a default route on net B, and then
sends redirects to anybody who uses it.  I understand that the usual
split horizon rules don't apply here since R2 learned the route via
net B but not from the same protocol, but I'd like to apply split
horizon just the same.  That is, if R2 learned a route (default in
this example, but it holds for any route) via net B, I don't want it
to advertise it on net B.  Period.

Can I do this?  Static filters aren't acceptable, and I can't just run
RIP because the networks are not homogenous and I want the routers to
use the "best" route available.

-- 
Karl Swartz		|INet	kls@unixhub.slac.stanford.edu
SLAC Computing Services	|	   or kls@ditka.chicago.com
1-415/926-3630		|UUCP	uunet!lll-winken!unixhub!kls  -or-  ditka!kls
(SLAC and the US Dept. of Energy don't necessarily agree with my opinions.)