From owner-freebsd-net@FreeBSD.ORG  Sat May 17 23:33:04 2014
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Date: Sat, 17 May 2014 16:32:57 -0700
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Subject: Re: arp strangeness?
From: Michael Sierchio <kudzu@tenebras.com>
To: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org>
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On Sat, May 17, 2014 at 4:30 PM, Ronald F. Guilmette <rfg@tristatelogic.com>
wrote:

> May 16 23:05:33 segfault kernel: arp: 69.62.255.254 moved from
00:1e:13:22:eb:51 to 00:00:0e:07:ac:00 on rl0
> May 16 23:05:33 segfault kernel: arp: 69.62.255.254 moved from
00:00:0e:07:ac:00 to 00:1e:13:22:eb:51 on rl0
> May 16 23:25:29 segfault kernel: arp: 69.62.255.254 moved from
00:1e:13:22:eb:51 to 00:00:0e:07:ac:00 on rl0
> May 16 23:25:29 segfault kernel: arp: 69.62.255.254 moved from
00:00:0e:07:ac:00 to 00:1e:13:22:eb:51 on rl0

Yeah, the router address may be a synthetic address shared by multiple
physical interfaces, or
it may be fictional and handled via multiple interfaces/routers/etc. in
your ISPs fabric running some HA
routing (via OSPF for example).

It's normal.

- M