To start things off, I have read http://forums.xbox.com/xbox_forums/xbox_support/f/9/t/7448.aspx and have all the appropriate ports and settings set up on my router and I still can't seem to stay online while I try to play a game
online like Halo or Marvel Ultimate Alliance 2. Staying connected while in a party also proves to be a problem. Anyhoo, here is what my network setup is like (bare with me as I'm not much of a techie):
Modem: Motorola SB5105 SURFboard Cable Modem
WiFi Router: NETGEAR WNR2000v3
ISP: Time Warner
Although it took me a while to figure out how to do it, I successfully opened all of the said ports and even assigned a reserved IP for my 360 and said ports. I read a bit further down in the link I posted and I think I may be having that problem with the double-NAT thing and, after scouring inside of my router, I couldn't figure out what to do. I'm afraid of clicking/touching things that I don't know about in there for fear of botching up my entire network and having some pissed off roommates.
PLEASE, someone, help me out so I can play online with you!