Mac Pro fails to find ethernet connection after sleep

My 2.66 Nehalem MP goes to sleep just fine. The problem is every time I re-awake the machine, it never finds the ethernet connection. I have to log out and log back in for it to reacquire the connection.
This isn't a problem when I sleep on the Mac side so doesn't seem to be purely hardware related. Any ideas what's wrong?

Sorry, I realized I posted this in the wrong place ... moving posting to the networking secgtion.

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