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List:       cisco-nsp
Subject:    Re: [nsp] traceroute and icmp
From:       kevin graham <kgraham () dotnetdotcom ! org>
Date:       2001-11-30 17:35:09
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> > Unix and Cisco IOS choose to use a UDP variant of it.  Microsoft uses a
> > straight ICMP.
> 
> Hmmm, you word it as if "ICMP is the right (or 'original') way of doing 
> it" - it isn't, VJ wrote the Unix version, using UDP.

...of course, most modern traceroute's have a '-I' or equivalent flag to
use ICMP rather than UDP. In the day and age of paranoid ACL'ing, when
working close to edges, probably have a better chance of ICMP echo's
getting through than ephemeral-to-ephemeral UDP.

..kg..

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