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

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Message-ID: <20101125165525.GA4480@adriano>
Date:	Fri, 26 Nov 2010 00:55:27 +0800
From:	"ZHANG, Le" <r0bertz@...too.org>
To:	David Miller <davem@...emloft.net>
Cc:	eric.dumazet@...il.com, 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

On 11:55 Sun 14 Nov     , David Miller wrote:
> 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.

Sorry, this question may be OT on this list, but I am just curious:

Is there any other OS has implemented this feature like Linux?

To be very specific, by this feature, I mean rejecting old duplicates based
on per-host cache of last timestamp received from any connections.
As suggested in RFC1323 Appendix B.2 (b).

Does anyone, by any chance, know the answer? Thanks in advance!

-- 
ZHANG, Le
http://zhangle.is-a-geek.org
0260 C902 B8F8 6506 6586 2B90 BC51 C808 1E4E 2973

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