Yeah, I'm stumped too. The above Hail Mary code didn't do anything for me, I'm afraid.
Worse: about half an hour after a reboot, the LAN stopped working. It began working again after I unplugged and replugged it.
I don't think this is really a networking issue. I think this is a USB issue. Perhaps I should make another post in a different forum.
I suppose that there's a slight chance that this is a hardware issue, but I doubt it. I had no troubles until after the upgrade to 10.10.
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