linux-kernel - Re: [PATCH] xt_TCPMSS: SYN packets are allowed to contain data

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Message-ID: <alpine.LSU.2.01.1001211356180.30772@obet.zrqbmnf.qr>
Date:	Thu, 21 Jan 2010 13:58:19 +0100 (CET)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Simon Arlott <simon@...e.lp0.eu>
cc:	Patrick McHardy <kaber@...sh.net>,
	William Allen Simpson <william.allen.simpson@...il.com>,
	netdev <netdev@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	netfilter-devel@...r.kernel.org
Subject: Re: [PATCH] xt_TCPMSS: SYN packets are allowed to contain data


On Thursday 2010-01-21 13:47, Simon Arlott wrote:
>
>The TCPMSS target can be applied to more than just one direction
>of traffic. I'm modifying incoming traffic too, so adding the MSS
>option and setting it to over 536 is wrong (although the first ICMP
>error will fix it).
>
>Existing users use this target precisely because their hosts are
>sending an unwanted MSS value, so it will never need to be added.

Ah, so they should be using TCPOPTSTRIP ;-)

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