Sure the forum shows you howto port forward... but what about the REST of the resolve? In ORDERING(At least until they fix it) to play online steadily (85% roughly of successful gameplay) you will need to OPEN YOUR NAT. This is an XBOX/PS3 port so you need to OPEN YOUR NAT as if you played it on an xbox or ps3. To understand more, just look up Open my NAT in google or click this link: https://www.google.com/webhp?rlz=1C1...w=1920&bih=916.
IF you have a modem that doesn't have a built in router( you have both a modem and a router sitting next to each other), look up how to "BRIDGE" the connection between your modem and Router.
If you have ADSL, try this: NOTE(Steps 4 - 6 or whatever is not needed)http://whirlpool.net.au/wiki/adsl_mo...er_bridge_mode
If you have Cable, try this:GOOGLE!!! lol Cable modems seem to be more of a headache so you need to google your modem/router models then look up howto bridge them. DSL Is kinda easy as most are the same regardless of modem.(At least that is my experience.)
If you have a modem/router all-in-one setup, make sure your WAN to WAN, LAN to LAN, LAN to WAN, and WAN to LAN are all permitted. Look here, this can be a universal tutorial: http://www.youtube.com/watch?v=Kvg6JDjLdkM
If you are in the RARE occasion where you are going from a router to a bridge or repeater via wireless, check this cool tutorial out as well: http://www.dd-wrt.com/wiki/index.php/Repeater_Bridge AND http://www.mydigitallife.info/turn-o...windows-vista/