netdev - Re: SYN attack, with FIN flag set

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Message-ID: <b3ae04aef6b0ce233e8e8978782d1ccc@visp.net.lb>
Date:	Sat, 03 Dec 2011 10:18:29 +0200
From:	Denys Fedoryshchenko <denys@...p.net.lb>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	<netdev@...r.kernel.org>
Subject: Re: SYN attack, with FIN flag set

 On Sat, 03 Dec 2011 08:55:02 +0100, Eric Dumazet wrote:
> Le samedi 03 décembre 2011 à 08:27 +0100, Eric Dumazet a écrit :
>
>> I believe netfilter tcp conntrack considers SYN|FIN as INVALID
>>
>
> Or if you cannot afford conntracking, just do
>
> iptables -A INPUT -p tcp --tcp-flags SYN,FIN SYN,FIN -j DROP

 Sure i did,thanks, but i just was curious, why connection with such 
 flags are threated as SYN.

 ---
 System administrator
 Denys Fedoryshchenko
 Virtual ISP S.A.L.
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