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

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Message-ID: <20130807205959.GC21463@macbook.localnet>
Date:	Wed, 7 Aug 2013 22:59:59 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Eric Dumazet <eric.dumazet@...il.com>
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, Aug 07, 2013 at 11:06:06AM -0700, Eric Dumazet wrote:
> 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>

No, not yet, will have a look. Not sure what you mean by "TCP timestamps
are not really used" though. I might be biased by usually only looking at
Linux traffic, but I was under that impression that everyone is using
TCP timestamps nowadays?
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