Re: [Int-area] WG Adoption Call: IP Fragmentation Considered Fragile

Brian E Carpenter <brian.e.carpenter@gmail.com> Fri, 27 July 2018 20:12 UTC

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To: Fernando Gont <fernando@gont.com.ar>, Tom Herbert <tom@herbertland.com>
Cc: "internet-area@ietf.org" <int-area@ietf.org>, "intarea-chairs@ietf.org" <intarea-chairs@ietf.org>
References: <F227637E-B12D-45AA-AD69-74C947409012@ericsson.com> <0466770D-C8CA-49BB-AC10-5805CFDFB165@strayalpha.com> <8e5ba0b3-837e-02d1-d9d9-7c5e596c1774@gont.com.ar> <CALx6S34VMeLS7bqL4Zt0xZ+==5hUT7Q2=5m01a14mJ4B3J6G3g@mail.gmail.com> <50a1e177-6b37-b89a-2caf-5caf1cbc955b@gont.com.ar>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Date: Sat, 28 Jul 2018 08:12:32 +1200
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Subject: Re: [Int-area] WG Adoption Call: IP Fragmentation Considered Fragile
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On 28/07/2018 04:25, Fernando Gont wrote:
> On 07/27/2018 05:15 PM, Tom Herbert wrote:
>> On Fri, Jul 27, 2018 at 5:38 AM, Fernando Gont <fernando@gont.com.ar> wrote:

...
>> So has the ship sailed for out ability to ever use
>> extension headers or any protocol other than TCP (and sometimes UDP)?
> 
> It would seem that that's the case, yes.
> 

Thanks, another point we should cover in draft-carpenter-limited domains.

Fragmentation, (PL)PMTUD, extension headers, and innovative
L4 protocols are very possibly not viable on the open Internet.
At least, we can't assume that they will work on arbitrary paths.
Sad but apparently true.

   Brian