Age of Empires 2: Conq. multiplayer help?

My friend and I (same city) ar unable to get into the same multiplayer game together. We don't know why. We tried all of the connections on the game and even gamespy, but nothing seems to work, I figure it is because of a different external and internal ip address, anyway to fix this?

mabye get your friend over to your house and hook up a lan connection to see if it is your comp. but if you have tried all other connections then it is probably not the internet