Multiple IPs and DNS Servers on One Machine

I've been looking around lately, and I'm not sure where the instructions are. I know that in the past, I'd been able to set up multiple IPs and multiple DNS server names to run on one physical machine. I had to tweak a template or two, but it worked well as a "master-slave" setup.

Does anybody remember how to do that?

Also, for Joe, I'm curious as to which Joomla-based forum you are using on this site. I've been looking over a few of them, and I've generally been disappointed with them.

• Mark