Here are some easy point for those who like to research.
My brother and I would like to play Diablo 2 over the Internet NOT using Battle.net. We haven't tried this yet but I thought I'd seek some potential advice. I know we can connect via IP address so that's no problem. However, we both connect via cable modems and have firewalls set up. Does D2 use specific ports for access and if so, what ports do we open up?