Things You'll Need
Instructions
Decide on the type of connection you want to make. If you do not need to share the connection with a PC you can connect directly to the modem, If you use a computer at home with an Internet connection the best method is to use a router so that both the computer and your Xbox 360 can share the connection.
Connect an end of the Ethernet cable to the same-named port on your modem. Connect the other end to the Uplink or WAN port on the router.
Connect the second Ethernet cable to the Ethernet LAN port on the router and the other end to the same-named port on your computer.
Plug one end of the third Ethernet cable to another Ethernet LAN port on the router and the other end fo the same port on the back of your Xbox 360 console.
Turn on the Xbox 360 and access the dashboard. Follow the on-screen instructions to complete your connection. You may have to enter information from your Internet service provider (ISP). Do this in the "System Settings" area under the "My Xbox" tab.