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MTU to CDN's

Subject: MTU to CDN's
From: jared at puck.nether.net (Jared Mauch)
Date: Fri, 19 Jan 2018 09:01:11 -0500
In-reply-to: <[email protected]>
References: <CAM3TTh3-H4s3iJS4JDydPHnGyRy1a+j8H8HjDTHHudkexZ1PQg@mail.gmail.com> <[email protected]> <[email protected]> <CAM3TTh2htLn4E79g8MMWXenXedFL0rK7jH4rwkuOS-3uepa-+Q@mail.gmail.com> <CAKr6gn1vD=fUXV6ULdzX4+Ao2_U5dz_4krwdo_+28b6jCTNcSQ@mail.gmail.com> <[email protected]> <CAP-guGVbFgicdVDagyNRq7qV4SmuTWWk7in8uTSVaBPbPgg26A@mail.gmail.com> <[email protected]> <CAP-guGW_EHaHDPx37=3z_7zP+h_LOWCoS-SmMa4qfCz+LmkWXw@mail.gmail.com> <[email protected]>

Bah, never mind.. reading my PCAP wrong :-(


> On Jan 19, 2018, at 8:58 AM, Jared Mauch <jared at puck.nether.net> wrote:
> 
> 
> 
>> On Jan 18, 2018, at 8:44 PM, William Herrin <bill at herrin.us> wrote:
>> 
>>> Which packet?  Is there a specific CDN that does this?  Iâ??d be curious to see
>>> data vs speculation.
>> 
>> Howdy,
>> 
>> Path MTU discovery (which sets the DF bit on TCP packets) is enabled
>> by default on -every- operating system that's shipped for decades now.
>> If you don't want it, you have to explicitly disable it. Disabling it
>> for any significant quantity of traffic is considered antisocial since
>> routers generally can't fragment in the hardware fast path.
> 
> Iâ??m not seeing this in a PCAP capture to at least one CDN, either from my
> host or from the CDN endpoint.
> 
> I suspect youâ??re mistaken.
> 
> - Jared
> 
> PCAP: https://puck.nether.net/~jared/akamai.pcap

References:
- MTU to CDN's
  - From: dovid at telecurve.com (Dovid Bender)
- MTU to CDN's
  - From: joelja at bogus.com (joel jaeggli)
- MTU to CDN's
  - From: bernat at luffy.cx (Vincent Bernat)
- 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: jared at puck.nether.net (Jared Mauch)
- MTU to CDN's
  - From: bill at herrin.us (William Herrin)
- MTU to CDN's
  - From: jared at puck.nether.net (Jared Mauch)
- MTU to CDN's
  - From: bill at herrin.us (William Herrin)
- MTU to CDN's
  - From: jared at puck.nether.net (Jared Mauch)

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