IP addresses

[SimplyBrilliant]

Do I have to worry about different IP addresses on the same server?

[CollectiveGenius]

It probably has something to do with NAT (Network Address Translation). The router takes care of the IP addresses on a LAN (Local Area Network). It deciphers or translates to the correct IP address it was originally assigned to through the external network which in most cases is the Internet.

[WonderfulWeb]

You can do that. All you need to do is set up additional IP addresses in the network configuration file. If you're a Windows user then it's on the NIC and for Unix it's /etc/rc.conf as aliases.