Try XLan to get play an online/systemlink gamesXLan Setup GuideGame Connection Tip:
On any system link game they have a limiter of about 20ms.
So you either need a super fast connection or use a slimmer version of M$ network.
That is why i setup the XLan, it is based on Linux so it uses your bandwith about 200% better then any M$ OS it also is self booting so it wont damage you current system. i have had GOW working fine with 4 players and no lagg(but we all are in the same county)A Tip to never be detected online again:
Manualy change the Default Gateway of the xbox 360.
this will stop any internet activity from the xbox but it will allow you to use streaming media and other tools
it is quite easy to do.
Goto your network setup.
Assign a manual IP Address and set you Default Gateway to your PC`s IP Address.
Press test setting and test Xbox Live.
it will sign you out, once the tests have started quickly cancel them.
Then go back then back again.
Now look at your Network setting they have saved ok.
Now you will not be at risk of ever going onto Live at all.