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Re: [Int-area] I-D Action: draft-ietf-intarea-frag-fragile-00.txt

Brian E Carpenter <brian.e.carpenter@gmail.com> Thu, 16 August 2018 20:53 UTC

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To: Tom Herbert <tom@herbertland.com>, Ole Troan <otroan@employees.org>
Cc: int-area <int-area@ietf.org>
References: <153434872145.14477.17942361917248825531@ietfa.amsl.com> <2c82b61e-8017-742e-764b-559f2ec4bd37@gmail.com> <alpine.DEB.2.20.1808160735400.19688@uplift.swm.pp.se> <AE241D6E-2379-4EFB-802C-BFBC840273E7@employees.org> <2BB8A510-DEA7-4543-9FF4-6D82D5ADBA53@strayalpha.com> <66DE41F9-32D7-45F2-AADB-37DD19A5F5A5@employees.org> <F15BBC81-F3BF-4762-B27E-61A418EA8356@strayalpha.com> <D6F35FA4-6305-464B-A1A6-667E0CE30985@employees.org> <CALx6S3644Hyo3iz2VWCqOWOo8MTMBTgVVPxrsxv-SZ20D8nxbw@mail.gmail.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Date: Fri, 17 Aug 2018 08:53:05 +1200
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Subject: Re: [Int-area] I-D Action: draft-ietf-intarea-frag-fragile-00.txt
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Getting back to the draft under discussion:

On 2018-08-17 05:56, Tom Herbert wrote:
...> The requirement that "Protocols/applications SHOULD avoid IP level
> fragmentation." already acknowledges and provides advice on the
> realities of the current state of fragmentation support in the
> network. 

Acknowledges, yes. Provides *useful* advice, no. That was my original
point. IMNSHO, useful advice would be "support PLPMTUD, and this
is how to do it." Otherwise, application developers are on their own.

> IMO, the statement that "Networks MUST support IP level
> fragmented packets." is appropriate. 

As a motto for the Internet, yes. For the present draft, not so much.

   Brian

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