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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html