From owner-freebsd-net@FreeBSD.ORG  Wed Dec 17 13:40:24 2008
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Date: Wed, 17 Dec 2008 14:29:49 +0100
From: Damien Touraine <touraine@users.sourceforge.net>
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Subject: link state change without reason ...
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Hi,

I have a big server that has 3 network cards (2 Intel(R) PRO/1000 
Gigabit Ethernet adapter and 1 3Com Etherlink XL and Fast Etherlink XL 
Ethernet).
I have trouble with the cards : several times per hour, the interface 
goes down and up with the following dmesg signal :
Dec 17 07:06:22 picpus kernel: em1: link state changed to DOWN
Dec 17 07:06:37 picpus kernel: em1: link state changed to UP


It appears on em1, xl0 but don't seem to be on em0.  Do you think that 
sysctl "net.link.ether.inet.log_arp_wrong_iface=1" should impact on this 
problem ?

Regards,
    Damien Touraine