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MTU to CDN's

Subject: MTU to CDN's
From: swmike at swm.pp.se (Mikael Abrahamsson)
Date: Fri, 19 Jan 2018 15:05:17 +0100 (CET)
In-reply-to: <2016421856.844.1516369686950.JavaMail.mhammett@ThunderFuck>
References: <CAM3TTh3-H4s3iJS4JDydPHnGyRy1a+j8H8HjDTHHudkexZ1PQg@mail.gmail.com> <CAM3TTh2htLn4E79g8MMWXenXedFL0rK7jH4rwkuOS-3uepa-+Q@mail.gmail.com> <CAKr6gn1vD=fUXV6ULdzX4+Ao2_U5dz_4krwdo_+28b6jCTNcSQ@mail.gmail.com> <[email protected]> <CAMCxY-FO7QLty2o9KUdHSbdYay8e1cNtDk96eFhhMZL9Ckc8fw@mail.gmail.com> <[email protected]> <CAMCxY-H3nTtRxvBiC_M6O+w=dt27cks7tBO0WYanr74pS-g8zw@mail.gmail.com> <[email protected]> <2016421856.844.1516369686950.JavaMail.mhammett@ThunderFuck>

On Fri, 19 Jan 2018, Mike Hammett wrote:

> Other than people improperly blocking ICMP, when does PMTUD not work? 
> Honest question, not troll.

Mismatch of MTU interface settings between interfaces, mismatch of MTU 
between L3 devices and intermediate L2 devices, anycast services, ECMP 
based services where the ICMP error is delivered to the wrong node.

So yes, there are plenty reasons that PMTUD doesn't work without anyone 
doing it because of ill will or incompetence.

-- 
Mikael Abrahamsson    email: swmike at swm.pp.se

Follow-Ups:
- MTU to CDN's
  - From: nanog at ics-il.net (Mike Hammett)
- MTU to CDN's
  - From: olivier.benghozi at wifirst.fr (Olivier Benghozi)

References:
- MTU to CDN's
  - From: dovid at telecurve.com (Dovid Bender)
- MTU to CDN's
  - From: dovid at telecurve.com (Dovid Bender)
- MTU to CDN's
  - From: ggm at algebras.org (George Michaelson)
- MTU to CDN's
  - From: bernat at luffy.cx (Vincent Bernat)
- MTU to CDN's
  - From: michael at wi-fiber.io (Michael Crapse)
- MTU to CDN's
  - From: swmike at swm.pp.se (Mikael Abrahamsson)
- MTU to CDN's
  - From: nanog at ics-il.net (Mike Hammett)

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