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Date: Sat, 22 May 2004 10:46:52 -0700 (PDT)
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Subject: kern/47648 creating alias on ethernet interface cause network to
 hang for 33 seconds
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I found this PR when trying to find information about this particular
problem (em driver pausing when you change alias information). The bug is
still present in 4.9 .

Anton Kornev supplied a fair amoung of information. Is there anything else
we can provide (as we're seeing it as well)?