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eth0, eth1 etc identify physical network devices, if you want to sub-interface (one physical device "split up" to serve 2 or more IP numbers), you need to do the following (as root, assuming eth0 works):
cp ifcfg-eth0 ifcfg-eth0:1
Now open ifcfg-eth0:1 with an editor and cahnge the following:
- DEVICE=eth0 to DEVICE=eth0:1
- IPADDR=[current value] to IPADDR=[ip address for subinterface]
Safe and exit and restart your network:
service network restart
This should work, but you do have to realize that:
- if your physical network card goes down, both IP adresses go down with it,
- If your card can handle, say, 100Mb, this is now shared.