should TCPs do MTU black hole detection?

Randy Bush randy at
Fri Nov 19 03:03:21 UTC 1999

>>  o when it breaks, the noc gets the call, debugs it, and it gets fixed
>                                                           ^^^^^^^^^^^^^
> Optimist!

but at least the user knows where the problem lies, as opposed to

>>  o when it breaks, the software does successive guesswork back-offs until
>>    it makes it through.  the performance sucks big-time, the customer
>>    thinks the isp is at fault, but the noc does not get called and the
>>    real problem never gets fixed.
> This one is pretty accurate though.

where the user thinks the isp sucks.  and the latter will be forever
increasing entropy.  the net as experienced just gets worse and worse.


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