OK confused here. Cable modem, router, 2 pc's on different floors. Don't want to go wireless (unless necessary). So if I hook up the cable and the modem and router downstairs-what do I plug into what upstairs? I had dsl and obviously used the phone jacks, but what do need for upstairs with the cable modem? I only want to share internet, nothing else. Mark

You need to run a network cable upstairs. There's a few kits that use the phone line for networking and one that I've seen that uses the 110VAC power outlets. I haven't used either of the last two and don't really trust them. It would be easiest to use wireless but cheaper to just run a network cable. Hope this helps! TJ

Plug the next available port on the router to the PC upstairs(with network cable). -DF

Thanks for the suggestions, but I think wireless is going to go. Any good suggestions or recommendations? I have comcast cable connection. Would love to share email if possible - we use outlook Express. Mark