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Re: [SPAM] Re: [SPAM] Your daily internet traffic report
From: Hugo van der Kooij <hvdkooij () vanderkooij org>
Date: Sun, 17 Oct 2004 11:19:23 +0200 (CEST)

On Sat, 16 Oct 2004 lee.e.rian () census gov wrote:

Most routers will regard any ICMP request to them as a low priority
issue.

do they? icmp is not only about 'echo'. there's lot of
other functions via type/code - fragmentation, mtu etc,
vital for traffic signalization. administrators, who
blindly closes all icmp traffic are plain stupid idiots.

Lots 'o flame but no light.

How about sharing your knowledge of why certain icmp traffic should be
allowed and the risks associated with allowing that traffic?

Just to name one: Path MTU discovery (RFC 1191)

   This memo describes a technique for dynamically discovering the
   maximum transmission unit (MTU) of an arbitrary internet path.  It
   specifies a small change to the way routers generate one type of ICMP
   message.

Hugo.

-- 
        I hate duplicates. Just reply to the relevant mailinglist.
        hvdkooij () vanderkooij org             http://hvdkooij.xs4all.nl/
                Don't meddle in the affairs of magicians,
                for they are subtle and quick to anger.

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