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From: Poul-Henning Kamp <phk@phk.freebsd.dk>
Date: Wed, 20 Sep 2006 11:20:50 +0000
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Subject: if_em goes mum
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Every few minutes my if_em goes mum, it receives packets but
does not transmit anything.

ifconfig em0 down ; sleep .1 ; ifconfig em0 up

makes it work again.
-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.