how do i use my wireless laptop as as an internet connection for my 360?
December 23rd, 2009 | 
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im using the ethernet cable that came with the 360 to connect it to my laptop but the ip address failed during the connection test
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http://www.jakeludington.com/xbox/20061208_xbox_network_connection_sharing.html
this should help
Just because your laptop is connected, doesn’t mean you XBOX will be also. You must be connected using a Sprint card or something.
you need a crossover cable or a hub, switch, or other multiport mechanism with at least two non-uplink ports. I would prefer a crossover cable its cheaper. you can get it on ebay or at radioshack.
Connect you laptop with your 360 using the crossover cable.
Open up Control Panel / Network Connections. You should see an Unidentified Network or some such (the connection to your 360) and a Wireless Network Connection.
Bridge the two connections by selecting them both, right-clicking on one or the other, and clicking Bridge Connections.
Windows will create a network bridge that will allow your 360 to use your laptop’s wireless connection.
Then test the connection on your 360 it should pass