From: Jason Opperisano <opie@817west.com>
To: netfilter@lists.netfilter.org
Subject: Re: tcpdump and Iptables
Date: Thu, 02 Sep 2004 14:06:31 -0400 [thread overview]
Message-ID: <1094148391.1994.2.camel@wolfpack.ljm.dom> (raw)
In-Reply-To: <41375ED1.5090400@kdtc.net>
On Thu, 2004-09-02 at 13:56, CC wrote:
> Hi,
>
> I think I've asked this before here, but I
> don't remember what the answer was.
>
> If I have iptables running and I do a
> tcpdump -i eth0, at what point is
> tcpdump listening to the connection?
tcpdump operates at the BPF layer, which is below netfilter.
if the the inbound interface is eth0; packets that will eventually be
dropped by netfilter will be captured by tcpdump.
if you're trying to see whether packets make it *through* the
firewall--tcpdump on the exiting interface.
-j
--
Jason Opperisano <opie@817west.com>
next prev parent reply other threads:[~2004-09-02 18:06 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-02 17:56 tcpdump and Iptables CC
2004-09-02 18:06 ` Jason Opperisano [this message]
2004-09-02 18:07 ` Nick Drage
2004-09-03 0:41 ` cc
2004-09-03 10:23 ` Nick Drage
2004-09-03 17:20 ` Jose Maria Lopez
2004-09-02 20:25 ` Jose Maria Lopez
-- strict thread matches above, loose matches on Subject: below --
2004-09-03 14:23 Hudson Delbert J Contr 61 CS/SCBN
2004-09-03 14:27 Hudson Delbert J Contr 61 CS/SCBN
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