netdev - Re: [PATCH net] tcp: don't allow syn packets without timestamps to pass tcp_tw

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Message-Id: <20140811.200807.1174604291924802129.davem@davemloft.net>
Date:	Mon, 11 Aug 2014 20:08:07 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	hannes@...essinduktion.org
Cc:	netdev@...r.kernel.org, fw@...len.de
Subject: Re: [PATCH net] tcp: don't allow syn packets without timestamps to
 pass tcp_tw_recycle logic

From: Hannes Frederic Sowa <hannes@...essinduktion.org>
Date: Tue, 12 Aug 2014 02:21:36 +0200

> Thus this broken situation could easily arise by a Linux and Windows
> box sharing one IP address and talking to a tcp_tw_recycle enabled
> server.

As Eric Dumazet mentioned, timewait recycling does not work if any
traffic goes through a NAT box.

So this situation of two boxes "sharing one IP address" fundamentally
makes timewait recycling unusable.
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