When I use my MacBook upstairs, I plug into an ethernet cable which is connected to my AirPort Extreme-n (to take advantage of faster file transfer speeds between machines). When I take it downstairs, I use the wireless. Is there a way to set it so that MacOS knows when I plug in the Ethernet cable and intelligently switches over to that, instead of using the wireless? Right now, I'm having to turn AirPort off on my MacBook whenever I'm plugged in, and this wreaks havoc on my AirDisk and is also a nuisance. Any help would be appreciated. Thanks!