Hosting a game with linkys box

[Xietor]

Anyone know the procedure to get around the firewall of a linkys router? I would like to host a mp game, but when i give the port and ip address, people cannot connect.

There was a thread on this issue on the dom II forum 2 years ago, but i can't find it. Used to host games but i cannot remember what i did to get past the firewall.

Thanks in advance if anyone knows the answer.