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Date:	Tue, 14 Oct 2014 09:54:30 -0700
From:	Christoph Paasch <christoph.paasch@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	johnwheffner@...il.com, eric.dumazet@...il.com,
	Yurij.Plotnikov@...etlabs.ru, netdev@...r.kernel.org,
	Alexandra.Kossovsky@...etlabs.ru
Subject: Re: TCP socket receives strange packet

On 14/10/14 - 12:50:04, David Miller wrote:
> From: Christoph Paasch <christoph.paasch@...il.com>
> Date: Tue, 14 Oct 2014 09:41:44 -0700
> 
> > there was a long discussion whether for the updated version of RFC1323 (now
> > published as RFC 7323) a segment must be dropped if it does not contain a
> > timestamp. The rationale (defended by Joe Touch) was that it must be there to
> > protect against wrapped sequence numbers while others argued that mandating
> > a drop might result in stalling connections if (for one reason or another) a
> > host sends a segment without TS (or a middlebox removed it).
> > 
> > The RFC now says that a host SHOULD drop segments without timestamps.
> 
> There are too many middle-boxes that drop timestamps for that to be a tenable
> way to behave, especially by default.
> 
> If you want to be disconnected from various parts of the internet, feel free
> to follow that RFC's recommendations.

I'm completely with you. We actually argued against Joe Touch, who wanted to
have a  "MUST" for dropping these segments without TS.


Cheers,
Christoph

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