aTV iTunes syncing issues.

 So here is the set up.

aTV running aTVFlash with XBMC installed. I have a 17' powerbook sharing it's internet connection through ethernet to the aTV so it can get online. The Powerbook is also hosting files for XBMC to stream. I am trying to sync the aTV with iTunes on my new MacBook Pro, but the apple TV and iTunes are not seeing each other the way it is set up now.

A little bit of trouble shooting I have done. I unplugged the ethernet going to the aTV, and when it was on the wireless it would see the macbook and sync just fine.

Does anyone know of a way for me to sync the aTV to iTunes the way it is set up?