We're -kind of- doing this here with PBR & GRE Tunnels - It's working well
for us. I imagine you could do the same thing here, couldn't you?
This is the iproute2 package...
Let me know if you need any config examples...
Ben
On Fri, 5 Jul 2002, Ken Ambrose wrote:
> Howdy, all. I'm moderately knowledgeable in routing, but I'm banging my
> head against the wall in this case: I've got a RH 7.2 box that has two
> NICs in it; one goes to our T-1 subnet, and the other to a cable modem --
> we've got it set up to act as a backup mail gateway if/when the T1 takes a
> hit. Works like a charm. HOWEVER, I can't seem to figure out how to get
> both interfaces to be "visible" at the same time from non-local hosts,
> thusly:
>
> /--------\ /--------\
> |Internet| |Internet|
> \--------/ \--------/
> | |
> 1.2.3.1 (router) 2.3.4.1 (Linksys behind cable modem)
> | |
> 1.2.3.2 (eth0) 2.3.4.2 (eth1)
> \ /
> \ /
> \ /
> -------------
> | mailhost |
> -------------
>
> Now I understand that having more than one default gateway is... weird,
> and, usually, means that you're running a routing protocol such as IGRP or
> somesuch. But what if you're not? Is there any way to say something like
> "if traffic originates on eth0, reply to it from eth0; if it comes from
> eth1, then use eth1", and go from there?
>
> Any hints/suggestions/etc., would be much appreciated.
>
> Thanks!
>
> -Ken
>
>
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