Clarify what you mean...

Do you have a dummy connection established, and it's failing to show up?
Or are you seeing one you didn't expect?

I'm running Diablo; there's now a USB-networking Control-panel-applet; I only tried it once, as it pretty much doesn't work with XP (AFAICT), and that's the main place I'd be interested. So I either use WiFi -> Internet (I don't think it actually leaves campus, but it is directly connected) -> Ethernet -> Desktop, or copy files onto the SD and plug in for file transfer. But if I remember right, it added a dummy connection named USB or some such, which seemed not to work (by reason of XP).

I don't have one showing up right now, and I'm not having a ton of success with my USB-ethernet adapter -- it connects to ethernet, but the dummy connection doesn't show up. I haven't had a chance to investigate, or even to try it in Chinook (yet).

HTH.