Im currently trying to connect my 360 to live via my college network in my dorm room. I will post as many details below as I can.
I connect to the internet by logging into the college network with a username and password. My connection to the networks as shown below:

My first attempt was to put my spare second network card into my pc and bridge the connections after I had logged in. I was still able to access the internet (considerably slower than usual) on my pc after I had bridged both connections but no such luck with the 360.
I next tried ICS with the same results. With the 360's network card displaying "unidentified network" below it, with a connection test saying that it was unable to get an IP address.

What am I doing wrong? Any assistance would be awesome!
Would I be able to change the 360's mac address to that of my PC and log into the network directly?
Cheers
Andy