Inside the recently released Thunderbolt Display from Apple is a fairly complete computer, including several controllers and other hardware trappings. The included Ethernet port on the rear of the display is not simply a passthrough, but requires a bona fide entry of its MAC address into NetDB. Yes, the display has a MAC address. Then again, doesn't your refrigerator?
This cost me 1+ hour this morning and an actual call to AppleCare, so hopefully this post can save others some headache.
Regards,
Vijoy
ps For this interested, here are some teardown pics on the display:
http://www.extremetech.com/computing/97795-apple-thunderbolt-display-tea...