You can statically configure more then one default gateway. In you particular case, you would probably want to have a higher metric on the default that you only want to be used during problem conditions.
Advanced uses may require that you use the iproute2 facility to implement policy based routing. There is a pretty good howto available for that, and is probably the right place to go for this. - Marc 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 > > > ***************************************************************** > To unsubscribe from this list, send mail to [EMAIL PROTECTED] > with the text 'unsubscribe gnhlug' in the message body. > ***************************************************************** > ***************************************************************** To unsubscribe from this list, send mail to [EMAIL PROTECTED] with the text 'unsubscribe gnhlug' in the message body. *****************************************************************
