easy way to scan for issues with path mtu discovery?

["Darden, Patrick S." <darden () armc org>]

Hi all,

Does anyone know of an easy way to scan for issues with path mtu discovery along a hop path?  E.g. if you think someone 
is black-holing along a route, or even on the endpoint host, could you use some obscure nmap flag to find out for sure, 
and also to identify the offending hop/router/host?  What tool would you use to test for this, and how would you do 
such a test?

Seems to me this happens often enough that someone has already figured it out, so I am trying not to reinvent the 
wheel.  All I can think of would be to handcraft packets (which is laborious at best).  Google has not been kind to my 
researches so far.

I appreciate any help!
--Patrick Darden
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