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Date:      Sun, 16 Dec 2001 19:24:05 -0500 (EST)
From:      Dru <>
To:        Frederico Costa <>
Cc:        <freebsd-questions@FreeBSD.ORG>
Subject:   Re: Question about IPFW and ICMP:8.0
Message-ID:  <>
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 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
> 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



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