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Hi,
You didn't tell us what unix are you talking about, but by the interface name ( eth ), i'm guessing Linux...
It's easy to create aliases ( multi-home ) to a single nic, you just have to configure the interface as you did the original one, but it's name will be eth0:n, where n is a number for the alias... for example:
ifconfig eth0:1 plumb - add the interface
ifconfig eth0:1 192.168.0.1 up - configures the interface with an IP address of 192.168.0.1
Maybe you have some way to do it automatically without having to write the commands... try to look at your linux distribution documentation.
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