> > 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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