i have2 xbox 360hooked up to my linkseys router, i play 1 game of halo

[Bonilla B]

and the 2nd game doesnt find a match? i have two xbox 360's hooked up to my linkseys router, i play one game of halo and the 2nd game doesnt find a match. is it that my router's settings aren't set correctly for this amount of halo speed?
the NAT isnt open and it said says that it is a slow connection do you know how to fix this?
my cables are plugged into everything correctly it lets me play one game then when i try to play another it either boots during the second game or doesnt find a match.

 

[Sven 7]

Okay,
1. Are you sure your ethernet cables are plugged into the back of the xbox?
2. Are they plugged into the right slots(there is a slot for the cable from the modem to router)


It sounds like a problem with your cable and where their plugged in.