From: John Haxby <john.haxby@oracle.com>
To: Mail List - Netfilter <netfilter@vger.kernel.org>
Subject: Re: Portsweep
Date: Wed, 24 Sep 2008 08:59:20 +0100 [thread overview]
Message-ID: <48D9F358.3020005@oracle.com> (raw)
In-Reply-To: <48D9534B.4080602@riverviewtech.net>
Grant Taylor wrote:
> On 09/23/08 01:51, bahamin takhtaei wrote:
>> Do you know How to use iptables against Portsweep attacks?
>
> There use to be a Port Scan Detection (psd) match extension that would
> help detecting this easier. I.e. did it look like a system was
> initiating a port scan, and if so, handle it accordingly (drop /
> reject / tar pit / etc.). I don't know what the current state of the
> psd match is, so you will have to find out.
FWIW, my Netgear DG834N has this in a chain called DOS:
SCAN all -- anywhere anywhere psd weight-threshold: 21 delay-threshold: 300 lo-ports-weight: 3 hi-ports-weight: 1
Netgear make their source available so you could try looking there.
jch
next prev parent reply other threads:[~2008-09-24 7:59 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-23 6:51 Portsweep bahamin takhtaei
2008-09-23 20:36 ` Portsweep Grant Taylor
2008-09-24 7:59 ` John Haxby [this message]
2008-09-24 13:55 ` Portsweep Grant Taylor
2008-09-24 8:24 ` Portsweep bahamin takhtaei
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