Managing interface with random MAC address

[Russ Dill <russ dill gmail com>]

I have an embedded device known as a beagle board that draws power
from my USB port (shows up as usb0). When it boots, it presents itself
as a USB ethernet device. I want to share my connection with the
device from network manager.

Two problems: The first is that network manager sees an unmanaged
device and tries to obtain an IP address, the second, I can't seem to
setup an automatic share my connection connection since every time the
board boots, it has a different hardware address. Any tips?