This is just a thought I've been mulling over, and no idea if it's even remotely technically feasible. Is it possible to set up a Teensy ++ 2.0 or a Teensy 3 as a 'virtual' ethernet device over USB? I notice that, on my mac, the USB Serial HID type will show up as a network interface, and I've been curious if it'd be possible to trick the computer into thinking there's actually an IP server/device on that connection.

Basically I want to make an ethernet device without actually using a physical ethernet connection. I wouldn't need or expect to be able to plug into a network hub/router or anything like that, but I have some ideas that would benefit from appearing as a network device to the host computer.