My Airport Extreme Base Station's 3 ethernet ports are full, and I want to connect a fourth wired device to it. How can I do this? The third ethernet output runs to the living room, connecting the Tivo to the LAN. I plan to add a videogame system which also needs to be networked. Can I connect that ethernet cable into the WAN input of a wired hub or router and then plug the Tivo and videogame into the outputs of the hub/router? I don't know the language to use to effectively google this solution. Everything is about extending a wireless network, but I want to be wired. Thanks for any help.