6.0 + intel em + mysterious gratuitous ARPs

[Julian Elischer]

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.



you have IPMI turned on.
the microntroller on the motherboard that controls such things
as remote power control, is doing the arps..

>
> 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??
>
> Thanks!
>
> Cheng
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