Battlefield2 -- Can't connect with m0n0wall (a linux router)
 

My network situation is a bit different then others, but I can't seem to sign on at all. My firewall is run as a linux router called monowall. so my connection looks like this
Cable Modem
PC (linux Monowall)
|_WAN NIC on monowall
|_LAN NIC on monowall
|_Goes to switch
|_Goes to my PC

So which ports do I need open, and can anyone offer me some advice so I can play them demo before it arrives wednesday.

Should also note that I get a Connection Refused Error, while trying to create an account....suggestions?