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Re: ICMP question
From: Fernando Gont <fernando () gont com ar>
Date: Fri, 19 Mar 2004 22:59:22 -0300

At 11:46 19/03/2004 +0800, cc wrote:

My firewall has been receiving an inordinate amount of ICMP
pings from external systems.

All systems from the same network, or what?

The strange thing about this
is that the ICMP packets coming to my firewall are actually
ICMP responses and not requests.

This is usual for smurf attacks.

I've looked at the logs (snort) and noticed that some
of these pings originate from *.cirn.net.   Has anyone
heard of this network?

Have a look at http://www.dshield.org , may be they have.

And then, some of these pongs contains a payload
which has the message "Please help me, matrix catch me".
I've been googling and couldn't find anything.
Does anyone have any idea what this ping response
might be?  A bot?

It depends on the amount of traffic, where all the packets come from, an any other pattern the packets may have.

Fernando Gont
e-mail: fernando () gont com ar || fgont () acm org

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