netdev - Re: SYN attack, with FIN flag set

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Message-ID: <1322898902.2762.81.camel@edumazet-laptop>
Date:	Sat, 03 Dec 2011 08:55:02 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Denys Fedoryshchenko <denys@...p.net.lb>
Cc:	netdev@...r.kernel.org
Subject: Re: SYN attack, with FIN flag set

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


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