Thanks.
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Say you have a class C of 111.222.333.xxx subnetted into blocks of 32 Ip
addresses. your subnet mask for each would be 255.255.255.224. You
could add a route to the first subnet on eth0 with
route add -net 111.222.333.0 netmask 255.255.255.224 eth0
likewise you could add the next one to anther interface (eth1) with
route add -net 111.222.333.32 netmask 255.255.255.224 eth1
and so on...
hope this helps
-Brian