Things You'll Need
Instructions
Connect your Xbox 360 to the Internet by connecting one end of the Ethernet cable to the console's Ethernet port, located on the rear, and the other end to your router's Ethernet port, also on the rear of the device.
Turn on the console and insert a game disc. Sign in to your Xbox Live gamer profile. Select Multiplayer and press "A" on the controller. Select "Host New Game" and press "A" again to start a new server online. You can configure various options like the level being played, the weapons on the map, and more, before starting the server.
Your console will load the game and create the server. Wait for other players to join and begin playing, your console will continue to hose the game server as long as it is turned on.