QUOTE(newfie4ever @ Feb 28 2008, 11:48 PM)

Ok I have 2 xbox 360's logged onto xbox live (different gamer tags) at same time. I have 2 legal Halo 3 games. Now my son's want to play against each other (and other people) online but they cant seem to connect to each other. They both can play other people online at same time but not each other. Also they cannot get the system link to work either with each other.
Son # 1 is connecting with a wireless adaptor.
Son # 2 is connected with ICS through his computer (which is connected to the internet with a wireless card)
Confused yet?
Anyway it comes up with Nat is open error when they try to connect online and no error with system link. They just can't see each other.
Whew got all that out.
Any help be great.
Thanks
A little more info...!
What is your complete setup for each xbox 360?
Do you have a router or gateway?