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Date: Thu, 19 Mar 2015 11:58:04 -0400
From: Eric van Gyzen <eric@vangyzen.net>
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To: "Paul S." <contact@winterei.se>, 
 freebsd-net <freebsd-net@freebsd.org>
Subject: Re: Unremovable ARP entry and 'address already in use'
References: <550A3271.2040501@winterei.se> <550A337C.9030905@winterei.se>
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> On 3/19/2015 =E5=8D=88=E5=89=8D 11:20, Paul S. wrote:
>> root@ipfw-0:~ # arp -d 110.62..211.87
>> arp: writing to routing socket: Invalid argument

I have a vague memory of similar behavior when I had a misconfigured
route.  I think there was a route for a local interface address with an
off-box gateway.  (Don't ask.  Long story.  Not my fault!  :) )

Eric