>I have 3 nics all on diff networks on a linux box.  Its redhat 6.2 no
>updates (yet as I wanted to test, then patch OS/Kernel).  Here is the
>route command I am trying to implement:
>
>route add -net 175.23.0.0 netmask 255.255.0.0 eth1
>route add -net 24.231.45.0 netmask 255.255.255.0 eth2

Assuming you have something like this listed in your /etc/hosts file:

127.0.0.1   localhost
175.23.0.1  ifcooh    ifcooh.yourdomain.com
24.231.45.1 ifcone    ifcone.yourdomain.com
24.231.45.2 gwmain    gwmain.yourdomain.com

Where ifcooh and ifctwo are the two NICs, and gwmain is a gateway host accessable on the ethernet connected to ifcone.

And this in your /etc/networks file:

127.0.0.0   loopback
175.23.0.0  netooh
24.231.45.0 netone

You can use the ifconfig command like this

/sbin/ifconfig lo   localhost broadcast 127.0.0.255
/sbin/ifconfig eth0 ifcooh    broadcast 175.23.0.255
/sbin/ifconfig eth1 ifcone    broadcast 24.231.45.255

Then you can use the route command, like this

/sbin/route add -net loopback netmask 255.0.0.0     dev lo
/sbin/route add -net netooh   netmask 255.255.255.0 dev eth0
/sbin/route add -net netone   netmask 255.255.255.0 dev eth1

You can also add routing for individual hosts:

/sbin/route add gwmain dev eth1

And you can use that as a default gateway,

/sbin/route add default  gw gwmain  dev eth1

Or, you can just default everything to that interface, and hope that something on that ethernet will route it:

/sbin/route add default dev eth1

Floyd L. Davidson