Road Runner cable service & DFTFD setup?
 

sorry i don't have there service or the hardware you are using. but maybe some one here can help you out. and knows what the router and port settings are for the game.

Same basic stuff with the router.

Just make sure you forward the correct ports ;)

if your modem is directly connected to your pc you shouldnt have to open any ports, just make sure you dont have a software firewall blocking anything.