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[Xombe]

Get the Xbox an internet connecting using ICS and hope you have enough speed
MS basic guide:
http://www.xbox.com/.../windowsics.htm  
other guide: http://www.chefelf.c.../networking.php

Or, get a (wireless) router, get your internet connection into that, then split it however you need (or use an Xbox wireless adapter for less wires, if you want).