Setting up my network

Hi. I've currently one computer connected to the internet 002.syd.iprinmus.com.au (from the outside world) and the other computers in my local network connect to the internet via a proxy server set up on this computer.

Is it possible to have that computer foward on connection requests to the appropriate computer in my lan (secondcomputer.002.syd.iprimus.com.au and thridcomputer.002.syd.iprimus.com.au)

Thanks

Well you would have to set yourself up as the DNS server for your own domain, use 3 seperate IP addresses, and setup static routing...