From owner-freebsd-stable@FreeBSD.ORG  Wed Oct 24 18:28:21 2012
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Date: Wed, 24 Oct 2012 14:28:13 -0400
From: Barney Wolff <barney@databus.com>
To: Jeremy Chadwick <jdc@koitsu.org>
Subject: Re: every 2nd echo-request malformed when ping -s >4067
Message-ID: <20121024182813.GA81641@pit.databus.com>
References: <20121024154017.GA3167@icarus.home.lan>
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 <20121024165148.GA4250@icarus.home.lan>
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Cc: Harald Schmalzbauer <h.schmalzbauer@omnilan.de>,
 Adrian Chadd <adrian@freebsd.org>, FreeBSD Stable <freebsd-stable@freebsd.org>
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0040 -> 4000 looks like a network byte order issue, perhaps.
I have a faint memory of issues of when tcpdump looks at packets,
determining whether UDP checksums are shown, for example.  Possibly
this is some artefact of outboarding?