Alright so I've been on about 10 different forums including xbox and xbox live chat, and nothing has helped me. My problem is I live in a dorm that requires registration of mac address, once you do that you can't connect to xbox live because it doesn't support WPA2 Enterprise, so im stuck.
I've also tried to bridge my macbook, and xbox with no success spent about 10 hours doing this as well.
you'd have to look up how to bridge your mac book and xbox. the school can't control if you're using the mac book as the access point. the easiest way is to use a crossover ethernet cable between the machines and internet connection sharing in Windows.