You could use another machine, Like IPCOP, and NAT. I know there's a way to spoof your MAC and IP, but I don't know why you'd want to. If you have a reason (that I don't really want to know about), then I would go that route. All you need a P.O.S computer w/ 2 Nics and the Install CD. That way, your PC is invisible and they only see the IPCOP box.