Mark:
It is possible to have multiple IP addresses on one nick. On RedHat based distributions, all you need to do is create a file is copy /etc/sysconfig/ifcfg-eth0 to /etc/sysconfig/ifcfg-eth0:N and edit it afterwards fixing up the values of IPADDR and DEVICE ( DEVICE should be eth0:N) - N here is the number of the alias , the first one would be eth0:0, then eth0:1, etc. Make sure to do "service network restart", and it is recommended that you hang around the physical console of the machine just in case you mess up and lose your network connection. I do not use GUI, but there is probably a good way to do it with GUI to.
This is one good way to do it, and probably the most common way, but what it really does it create a virtual ethernet device (Layer 2), there's also a way to create the IP alias at Layer 3. Use the 'ip' command (part of the iproute package I think) to set that up. I'm not sure if there is a way to have the system do this for you like there is with the virtual ethernet device though. If you're interested type 'ip addr help' for a synopsis. There's also a larger more readable document somewhere, on my system it's /usr/share/doc/iproute-2.4.7/ip-cref.ps.
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