From mboxrd@z Thu Jan  1 00:00:00 1970
From: Hannes Frederic Sowa <hannes@stressinduktion.org>
Subject: Re: unable to send TCP SYNs from ports below 1024
Date: Wed, 15 Jan 2014 12:47:15 +0100
Message-ID: <20140115114715.GC19945@order.stressinduktion.org>
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To: Stuart Kendrick <stuart.kendrick.sea@gmail.com>
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On Tue, Jan 14, 2014 at 05:37:03PM -0800, Stuart Kendrick wrote:
> VALIDATION
> I verify the problem by using netcat plus two instances of tcpdump,
> one running on the box itself, the other running on a second box
> plugged into a SPAN port on the local Ethernet switch

This sounds strange. Could you try to skip the switch and plug the
boxes together directly. Maybe a switch policy? They can filter such
things nowaday.

Greetings,

  Hannes