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From: Jung-uk Kim <jkim@FreeBSD.org>
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Date: Wed, 12 Apr 2006 16:06:29 -0400
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Cc: Cheng Jin <chengjin@cs.caltech.edu>
Subject: Re: 6.0 + intel em + mysterious gratuitous ARPs
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On Wednesday 12 April 2006 03:16 pm, Cheng Jin wrote:
> Hi,
>
> I am running the 6.0 release on a supermicro 5015M-MF motherboard
> with intel's 82573v dual gigE.  by default only one of the two
> ports are detected, although i was able to get both to work
> following the advice here
> http://www.freebsd.org/cgi/query-pr.cgi?pr=94281
>
> the real puzzling thing is that em0 would send out a gratuitous arp
> every 2 seconds with the IP address of 192.168.0.18 even though I
> configured it to have a completely different IP address,
> 10.10.10.252. also, i was only able to see these arp messages on a
> machine that is directly connected to em0.  tcpdump on em0 doesnt
> show any of the arp packets.
>
> I searched my /etc and also the kernel source tree, and this
> particular ip is nowhere to be found.  Is the card doing this crazy
> thing all by itself??

You may have an IPMI capable board for remote management and 
monitoring.  Turn it off from BIOS configuration if you can.

Jung-uk Kim