ICMP & PathMTU (was: Re: Extreme Slowness)

Randy Bush randy at psg.com
Fri Oct 27 03:06:55 UTC 2006

> 1) What value is ICMP if everybody pretty much considers it's accuracy
>    suspect?

because for some uses, narrow precision is not needed.  like is it
pingable?  what is the current path?

my eyes are not highly accurate at measuring distance, color, size,
motion, ...  accurately.  but i'll keep them, thanks.

> 2) How does ICMP's suspect nature affect Path MTU?

pmtu is hosed for other sicker reasons



on precision
    guy is at mummy exhibit in british museum
    asks guard how old mummy is
    guard says 2007 years
    guy asks how he knows 2007
    guard replies that he's been here seven years and mummy was 2000
    years old when he got here

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