[PLUG] Silly routing question

[Eric Hidle <eric.hidle@gmail.com>]

Okay, so I am trying to run some testing on an Ethernet switch-like device. I have two PCs each with 4 Ethernet ports running linux. 

What I would like to do is be able to ping one interface on a box from another interface on the same box (using the -I option for example) and have that ping actually go out on the wire as opposed to simply hit the local stack. 

So, if PC1 has 192.168.0.1-4 and PC2 has 192.168.1.5-8, and I "ping 192.168.0.1 -I 192.168.0.2", I'd like to see that packet go out the wire and the response come back on the same path. 

Is there any reasonable way to do this? I messed around with some routing tables but still couldn't get the thing to work right:

ip route add 192.168.0.0/24 dev eth# src 192.168.0.# table if#
--- etc cetera

Any advice? 
Thanks
E
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