To assign more than one ip address per physical interface you can do
things like:
ifconfig eth0:1 192.168.169.170 255.255.255.0 up
(the preceding ":1", ":2", etc... denotes "alias" interfaces)
Better than ussing aliases is to connect the routers to a vlan capable
switch and define a dotted 1q interface (trunk).
In this manner, the security is better than ussing alias interfaces.
In the other hand, if you are thinking about "load balancing" isp
providers take a look at ip route 2, it is a very usefull tool (read
"linux advanced routing" howtos).
Best regards
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