An end to an infuriating ethernet bug!

So for the past few weeks, I’ve been experiencing an infuriating bug with my ethernet connection and OSX. The short, short version, is that booting into windows break ethernet in OSX, leaving ethernet constantly with a self-assigned ip. No matter of configuration would change this. I could manually setup the IP config, release/renew dhcp, setup manual IP settings, disable the connection, remove the connection entirely, reboot, and set it up again, etc., etc., etc.

Only one thing would work, physically pulling the power cord from the computer.

Needless to say it’s a bit annoying to have to pull the plug every time you want to reboot from one OS to another.

Well, tonight I think I’ve finally found a solution!

I dug around the intel ethernet driver config options on windows, and in addition to “Wake on Magic Packet” (which has always been there, and I use for wake-on-lan) I found the following settings:

  • Wake on Pattern Match
  • Wake on Magic Packet from Power Off State
  • Wake on Link Settings

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So I disabled those settings, and ethernet is once again working fine from a normal/hot reboot! I’ll try them all one by one later, but I suspect it’s the “Power Off State” setting that was causing the issue.

23 October, 2014 – UPDATE: So I did some more isolation testing, and indeed it’s only the ‘Wake on Magic Packet from Power Off’ setting that needs to be disabled, the other two don’t affect my ethernet connection in OSX.

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