netdev - Re: unable to send TCP SYNs from ports below 1024

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Message-ID: <20140115114715.GC19945@order.stressinduktion.org>
Date:	Wed, 15 Jan 2014 12:47:15 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Stuart Kendrick <stuart.kendrick.sea@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: unable to send TCP SYNs from ports below 1024

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

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