From: Harald Welte <laforge@gnumonks.org>
To: Linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: Packet capturing, iptables and eth0 vs. dummy0
Date: Wed, 17 Nov 2004 22:38:43 +0100 [thread overview]
Message-ID: <20041117213843.GV31538@sunbeam.de.gnumonks.org> (raw)
In-Reply-To: <20041117203033.GA7907@DervishD>
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On Wed, Nov 17, 2004 at 09:30:33PM +0100, DervishD wrote:
> Hi all :)
Hi!
please send netfilter/iptables related questions to the respective
lists:
netfilter@lists.netfilter.org (for user questions)
netfilter-devel@lists.netfilter.org (for development issues)
> I've noticed that, no matter what filtering is iptables doing,
> tcpdump gets all packets from interface eth0 as seen in the bus,
This is correct. iptables is a IPv4 packet filter. It is part of the
IPv4 stack. tcpdump uses PF_PACKET which attaches right above the
NIC driver, therefore you capture packets way before they enter the IPv4
stack.
> Raúl Núñez de Arenas Coronado
--
- Harald Welte <laforge@gnumonks.org> http://www.gnumonks.org/
============================================================================
Programming is like sex: One mistake and you have to support it your lifetime
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next prev parent reply other threads:[~2004-11-17 21:54 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-17 20:30 DervishD
2004-11-17 20:46 ` Don Lafontaine
2004-11-17 21:00 ` Martin Josefsson
2004-11-17 23:14 ` DervishD
2004-11-17 21:38 ` Harald Welte [this message]
2004-11-17 23:17 ` DervishD
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