Why the game won't let me play?

i need someone’s help to tell me why. My first roommate has the main internet link on, and my 2nd roommate is using the rounter to play halo reach, as well im in my 3rd room with the 3rd rounter and wouldn’t let me play. is it because of the rounter in 3rd party making it diffacult to play? I play in my 2nd roommate room with split screen. and it work perfectly fine with my gamertag. but not in my room… anyone have any idea why?

The only thing I can think of is that if you have a xbox slim or a wifi adapter then you can just connect to your wifi instead of using your router.

Damn… all right, i will see if that work. I just don’t know why it doesn’t work that way. any idea how bungie can answer me when im been waiting for em?