From: Anders Fugmann <afu@fugmann.dhs.org>
To: Cedric Blancher <blancher@cartel-securite.fr>
Cc: netfilter@lists.netfilter.org
Subject: Re: NEW vs INVALID
Date: Tue, 01 Oct 2002 11:05:10 +0200 [thread overview]
Message-ID: <3D996546.3070408@fugmann.dhs.org> (raw)
In-Reply-To: 1033462154.878.17.camel@elendil
Cedric Blancher wrote:
> By the way, I was wondering why --syn was "only" equivalent to :
> --tcp-flags SYN,ACK,RST SYN
>
> And not to :
> --tcp-flags SYN,ACK,RST,FIN SYN
>
The tcp-flags would then not match packets with the SYN & FIN bits set,
which is actually connection request, with should be closed immdiatly
after opening. The syn-fin is widly used to scan hosts, and should be
dropped. But still - it is a connection request and should therfore be
caught by --syn.
Regards
Anders Fugmann
--
Neo: 'Can you fly that thing?'
Trinity: 'Not yet'.
$ apt-get install pilot-prg-v212helicopter.
next prev parent reply other threads:[~2002-10-01 9:05 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-30 10:18 NEW vs INVALID Jens Lechtenbörger
2002-09-30 14:39 ` Anders Fugmann
2002-10-01 8:49 ` Cedric Blancher
2002-10-01 9:05 ` Anders Fugmann [this message]
2002-10-01 11:19 ` Cedric Blancher
2002-09-30 15:26 ` Cedric Blancher
2002-09-30 15:50 ` Jens Lechtenbörger
2002-10-01 10:33 ` Martijn Klingens
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