netdev - Re: RFC: netfilter: synproxy iptables target

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Message-ID: <1274365963.4046.39.camel@edumazet-laptop>
Date:	Thu, 20 May 2010 16:32:43 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Changli Gao <xiaosuo@...il.com>
Cc:	Patrick McHardy <kaber@...sh.net>,
	Netfilter Developer Mailing List 
	<netfilter-devel@...r.kernel.org>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: RFC: netfilter: synproxy iptables target

Le jeudi 20 mai 2010 à 22:21 +0800, Changli Gao a écrit :

> 
> pure synproxy can be used on firewall to protect the internal servers,
> which don't support neither syncookies and synproxy, from the attack
> of SYN-flood.
> 

protecting servers using conntracking ?

Thats seems very dangerous to me.

> synproxy with defered connection relay acts as a layer 7 proxy, but
> works in kernel space totally, unlike tcp splice tech., which needs
> the applications in user space parse the requests, and establish the
> connections.
> 

In the example given, only non persistent connections are handled...

These days, browsers and servers dont establish one socket per http
request...



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