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Network Security Security-Basics
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RE: Removing ping/icmp from a network

Subject: RE: Removing ping/icmp from a network
Date: Wed, 26 Mar 2008 12:29:02 -0700
From: Jason Thompson
Subject: Re: Removing ping/icmp from a network


[snip]

I don't see any ICMP messages that are a MUST for network operation.

The one system that I know makes use of ICMP messages is Active
Directory. 
It uses ICMP to establish a number of parameters regarding speed of the
links 
between Clients and Domain controllers. See the note at the following KB

article for some details:
http://support.microsoft.com/kb/227260/

With this in mind, you could setup rules for ICMP traffic to only be
allowed 
to Domain Controllers, which would be sufficient for normal operation of
AD.

Jok


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