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RE: icmp echo-requests?
From: DE VILLIERS IAN <ian.devilliers () alc co za>
Date: Fri, 22 Nov 2002 11:41:35 +0200

A lot of malware (including Tribal Flood Network) communicate between
client/server using structured ICMP packets.

-----Original Message-----
From: JR [mailto:jr () secureity de] 
Sent: 2002/11/20 10:21
To: security-basics () securityfocus com
Subject: icmp echo-requests?

Hi everyone,

in my firewall logs I see a lot of echo-requests within the internal
network. Of course, the simplest answer to these events is that pings are
causing these events. But on these machines definitely no pings are startet
to that times. Is it possible that other kind of programs  are using
echo-requests? What kind of programs are using echo-requests and why?
Checking wether the other host ist up? What if the firewall is filtering
echo-requests? The program would think that the host is down...


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