Ed,

On a Mac, a very option rich tool with an easy GUI is WhatRoute.  It's now 
freeware, downloadable from VersionTracker.  It allows you full control of all 
the settings you'll need to track your issue with ping and trace.

http://www.versiontracker.com/dyn/moreinfo/macosx/17101

You could also do all this by giving the correct options to the OS X (or any 
good *nix) command line tools. Though that is very tedious, an Intermapper 
command line probe could then be developed.  Sorry, I haven't looked to see how 
you could modify the Ping/Echo probe to fit your needs.

Good Luck,
Randy Millsop
Network Administrator
San Joaquin Delta College

----- Original Message -----
From: "Ed Konowal" <[EMAIL PROTECTED]>
To: "InterMapper Discussion" <[email protected]>
Sent: Friday, September 19, 2008 8:39:34 AM GMT -08:00 US/Canada Pacific
Subject: [IM-Talk] Anyone have MTU problems?

We have a infrequent but recurring problem with our telco.  Every few
weeks they seem to screw something up and we have an MTU problem, which
we have to convience them is their problem.

My problem is, I don't have a tool to scan all my sites with 1500 byte
packets.  Does anyone else have this problem?  Anyone have a solution?

When it's just an MTU problem, you can't see it with normal pings or
even SNMP.  To me my network looks good... Until a site calls to tell me
it's not working.

Ed Konowal
Network Operations Supervisor
Lee County School District
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