Gaming problems

Ok I used a router for some time it was perfectly fine no problems but then my othrer computer downstairs crapped out so i disconnected the router and just used the modem

Now since i plugged the router back in any game I play online

EG: counter strike doesnt connect to any server i try to join and also gunz online also gives me errors

halp?

you didn't forward the required ports.
http://www.portforward.com/

>>2


i didnt have to forward the ports last time i had my router connected