detect a PMTU black hole router

From: Ben Zheng (bzheng8989@yahoo.com)
Date: Thu Nov 16 2006 - 02:13:47 ART

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what is an easy way to detect a PMTU black hole router?

I could use ping with
-f and -l options to find MTU, but how do I know which router in the path has
the smaller MTU setting?

Thanks

Ben

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