HP3000-L Archives

January 1999, Week 1

HP3000-L@RAVEN.UTC.EDU

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Subject:
From:
"Michael P. Smith" <[log in to unmask]>
Reply To:
Michael P. Smith
Date:
Wed, 30 Dec 1998 14:36:10 -0600
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Jim Alexander wrote in message ...
>Does anyone know of (or have available) a MPE/iX or a ported (or unported)
GNU
>Trace Route program?


It would be a waste of time.  Most (if not all) trace route programs use the
TTL field to timeout a packet before it reaches it's destination.  By doing
this they can force a packet to return to the originator (you) with a
timeout error and the name of the IP address it had reached when it timed
out.  By starting with a low TTL value and slowly increasing it on a per
packet basis you can find all your individual hops.  Unfortunately, the TTL
field is not accessible to HP/3000 programmers.  I don't know if this is
true, but I was told that the TTL field is actually hardcoded to some large
number (200 or 2000 or something like that).  The reason?  Why...no body
would ever want a packet to fail unless there was a problem, would they?

 ---------------------------------------------------------------
| Michael P. Smith                                              |
| Sr. Systems Programmer                                        |
| The Hertz Corporation    [log in to unmask] (work)          |
| Oklahoma City, OK        [log in to unmask] (personal)      |
 ---------------------------------------------------------------
The thoughts, views and expressions contained in this message are those
of Michael P. Smith, and do not necessarily reflect those of the Hertz
Corporation.  To reply via email, remove the .xx from email address.

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