linux-kernel - Re: [PATCH] ipv4: mitigate an integer underflow when comparing tcp timestamps

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Message-Id: <20101114.115536.71112799.davem@davemloft.net>
Date:	Sun, 14 Nov 2010 11:55:36 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	r0bertz@...too.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kuznet@....inr.ac.ru,
	pekkas@...core.fi, jmorris@...ei.org, yoshfuji@...ux-ipv6.org,
	kaber@...sh.net
Subject: Re: [PATCH] ipv4: mitigate an integer underflow when comparing tcp
 timestamps

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Sun, 14 Nov 2010 09:52:25 +0100

> Really, if you have multiple clients behind a common NAT, you cannot use
> this code at all, since NAT doesnt usually change TCP timestamps.

NAT is %100 incompatible with TW recycling, full stop.

There is no maybe, or maybe not.

If you are behind NAT you must not turn this feature on, ever.
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