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Date:      Sun, 16 Dec 2001 19:24:05 -0500 (EST)
From:      Dru <genisis@istar.ca>
To:        Frederico Costa <frederico.costa@tiscali.no>
Cc:        <freebsd-questions@FreeBSD.ORG>
Subject:   Re: Question about IPFW and ICMP:8.0
Message-ID:  <20011216192056.O85100-100000@x1-6-00-50-ba-de-36-33.kico1.on.home.com>
In-Reply-To: <000201c1868e$5a2affd0$0301a8c0@maxi>

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On Mon, 17 Dec 2001, Frederico Costa wrote:

> Hi all ...
>
> I have been using FreeBSD for almost 5 years, and lately because of the
> several attempts to penetrate my system, I have set up ipfw to restrict
> access from the outside to my network.
>
> Everything is working quiet well, but I am getting the following log
> from ipfw several times:
>
> server /kernel: ipfw: 65435 Deny ICMP:8.0 213.142.81.223 64.4.13.33 out
> via tun0
>
> I have been able to understand most of the logs, but this one I just
> understand that ICMP is trying to send something out to server
> 64.4.13.33. but it is saying ICMP:8.0
> What that means ?
>
> And why should my server initiate connection without my knowledge ?
>
> Thanks in advance for any information...

Hi Frederico,

ICMP Type 8 Code 0 is an ICMP echo request, usually used by the Ping
program. You might enjoy this article if you want to learn more about
ICMP:

http://www.onlamp.com/pub/a/bsd/2001/04/04/FreeBSD_Basics.html

HTH,

Dru


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