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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