Hi,
This is one I am using here. Its a network <=> network setup but it might shed some clues.
!/bin/bash
route del -net 10.1.0.0 netmask 255.255.255.0 gw 10.0.0.1
route del -net 192.168.1.0 netmask 255.255.255.0 gw 10.0.0.1
route add -net 192.168.1.0 netmask 255.255.255.0 gw $5
The server is in server only mode - and eth0 is 10.0.0.1.
Regards Duncan