ICMP & PathMTU (was: Re: Extreme Slowness)

On Thu, 2006-10-26 at 18:01 -0400, Elijah Savage wrote:

For FYI :) I realize that ICMP is not the best way to test and it is not a true indication of slowness or the presence of a problem.

Two questions for everybody...(any and all responses appreciated, even if the reply mentions botnets or hammers ;-) ) 1) What value is ICMP if everybody pretty much considers it's accuracy suspect? 2) How does ICMP's suspect nature affect Path MTU? -Jim P.