I have a question that's been bugging me for a little while now.

I have an Netgear RT314 router hooked up to a Cisco 678 DSL modem. I have tried placing my computer "outside" meaning typing in my IP address in the default area in the routers menu # 15. Then I try to host or play a game (AOE2). I cannot connect to other people nor can they connect to me. I thought this was the way to solve this?!?! I was thinking maybe the Cisco could use some "tweeking" as well?