Upstairs I have my AT&T provided router's wireless turned off and have plugged my Airport Extreme into the ethernet in DMZ mode. Wireless works fine in the house. Downstairs my Xbox 360's ethernet cable is plugged into my AT&T provided set-top box (receiver/DVR) and internet works fine on that. I cannot stream my media (using 360 Connect) from my mac to my xbox since they are on different networks, although using the same U-verse connection. When checking the AT&T router's system summary page I can see that there is an IP assigned to the xbox. So how do I resolve this? I don't want to put the xbox on a wireless connection. Is it something with port forwarding, or what? Thanks.