USB as "second nic"

Hi all, may be in the situation where I'd want to create a "second nic" via usb->ethernet. 1. Is this insane/impossible? 2. If the answer to (1) is no, how would one tell e.g. yast to configure such a thing? If the answer involves "Add line to 70-persistent-net.rules", how does one figure out the Mac addr for a usb connection? TIA, Michael -- Michael Fischer michael@visv.net