From: "krv" <krv@kaevee.com>
To: netfilter@lists.netfilter.org
Subject: Re: Synfloods - SNAT slow down
Date: Fri, 23 Apr 2004 20:25:07 +0530 [thread overview]
Message-ID: <00c601c42942$f7b919e0$2800a8c0@jupiter> (raw)
In-Reply-To: 005f01c42940$79a18210$1202a8c0@admin
----- Original Message -----
From: "Rob Sterenborg" <rob@sterenborg.info>
To: <netfilter@lists.netfilter.org>
Sent: Friday, April 23, 2004 8:07 PM
Subject: Re: Synfloods - SNAT slow down
> > I have two thousand hosts and two thousand forward rules :(
>
> With so many hosts/rules you should be able to match subnets instead of
> each host separately, reducing the number of rules greatly which in turn
> improves Netfilter performance. Or do you have a special reason to do
> this ?
>
>
> Gr,
> Rob
>
I had seen a patch in patch-o-matic which is supposed to fix a performance
issue in SNAT during floods. In fact the current kernel runs with the above
said patch.
You are right. In fact, I am rewriting the script which will generate
netfilter rules. I wanted to find out whether I can fine tune the new
netfilter rule set to offset the overloading of the gateway due to syn/icmp
floods.
Do you think, if I have a hierarchical filter rule set, there would be an
improvement?
KRV
prev parent reply other threads:[~2004-04-23 14:55 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-04-23 1:23 Synfloods - SNAT slow down krv
2004-04-23 7:01 ` David Cannings
2004-04-23 13:43 ` krv
2004-04-23 14:37 ` Rob Sterenborg
2004-04-23 14:55 ` krv [this message]
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