Using a wireless router as a home network switch

Solution 1:

Most routers have some variations on your requested functionality, but not all.

By default, the wireless interface, and the 4 LAN ports are "switched". What may cause issues is the router's DHCP server. For simple LAN functionality, you can disable it via the steps shown on Page 6 of the WRT54g manual.

By disabling your DHCP server, the responsibility of ensuring that everything in the network has an IP address falls to you. The LAN connection on your computer should have an IP address from 192.168.1.1-192.168.1.254, and the X-Box, a different address. Subnet Masks will be 255.255.255.0 and the Gateway will be the IP address of your computer.

Solution 2:

If you want to go with ont cable from Xbox to PC you probably would need a crossover cable. However, your router should be able to do it. Make sure your router is set up with DHCP on and plug both computers into the switch ports, and nothing into the "LAN" port.

Watch out how much you downloat over that AT&T card...most have caps at about 5GB