Things You'll Need
Instructions
Via a Router
Ensure that your router is connected to the household or office modem. It should be connected via the WAN port.
Insert an Ethernet cable into your computer's Ethernet jack and then run it to the router. Connect the other end to one of the router's Ethernet jacks.
Connect your Xbox to the router using another Ethernet cable. Your computer and Xbox are now connected to each other via the household or office network.
Direct Connection
Connect the Ethernet cable to your PC's Ethernet jack.
Run the cable to your Xbox.
Insert the other end of the Ethernet cable into your Xbox's Ethernet jack. This creates a direct connection between your Xbox and PC so that you don't need a router. In the process, though, you block your PC's Ethernet jack so that it cannot connect to the modem directly. If you have a second Ethernet jack or a wireless card, you can still connect to the modem.