netdev - Re: [PATCH RFC 0/5] netfilter: implement netfilter SYN proxy

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Date:	Wed, 07 Aug 2013 11:06:06 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	pablo@...filter.org, netfilter-devel@...r.kernel.org,
	netdev@...r.kernel.org, mph@....com, jesper.brouer@...il.com,
	as@....com
Subject: Re: [PATCH RFC 0/5] netfilter: implement netfilter SYN proxy

On Wed, 2013-08-07 at 19:42 +0200, Patrick McHardy wrote:

> 
> The SYNPROXY operates by marking the initial SYN from the client as UNTRACKED
> and directing it to the SYNPROXY target. The target responds with a SYN/ACK
> containing a cookie and encodes options such as window scaling factor, SACK
> perm etc. into the timestamp, if timestamps are used (similar to TCP). The
> window size is set to zero. The response is also sent as untracked packet.

TCP timestamps are not really used, for various reasons ...

Have you taken a look at 

<http://lists.freebsd.org/pipermail/freebsd-net/2013-July/035999.html>



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