Re: [core] Éric Vyncke's No Objection on draft-ietf-core-new-block-11: (with COMMENT) Mon, 03 May 2021 12:36 UTC

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Date: Mon, 3 May 2021 12:36:03 +0000
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Hi Eric, 

Thank you for the comments. 

Please see inline.


> -----Message d'origine-----
> De : Éric Vyncke via Datatracker []
> Envoyé : lundi 3 mai 2021 14:17
> À : The IESG <>
> Cc :;;
> Objet : Éric Vyncke's No Objection on draft-ietf-core-new-block-11:
> (with COMMENT)
> Éric Vyncke has entered the following ballot position for
> draft-ietf-core-new-block-11: No Objection
> When responding, please keep the subject line intact and reply to all
> email addresses included in the To and CC lines. (Feel free to cut
> this introductory paragraph, however.)
> Please refer to
> criteria.html
> for more information about DISCUSS and COMMENT positions.
> The document, along with other ballot positions, can be found here:
> ---------------------------------------------------------------------
> -
> ---------------------------------------------------------------------
> -
> Thank you for the work put into this document.
> Please find below some non-blocking COMMENT points (but replies would
> be appreciated especially on the intended status/lack of public
> implementations).
> I hope that this helps to improve the document,
> Regards,
> -éric
> == COMMENTS ==
> !!! I was about to ballot a DISCUSS on this point... In the absence
> of a section about existing implementations for such a new transport,
> I really wonder whether standard track should be used rather then
> experimental. Did the authors/WG run some simulations ?

[Med] There is an implementation and a PR was pushed so that this functionality is supported in the libcoap. Please refer to the following from the write-up:

A Pull-Request of an author's implementation to "libcoap" is available at 

Feedback from the implementation activity has contributed to the design and refinement of specific aspects, notably:

- Limiting new mechanics for congestion control only to CoAP Non-Confirmable messages.
- Not mixing CoAP Confirmable and Non-Confirmable messages for a same request/response body.
- The 'Continue' indication of successfully received blocks.
- The discovery of server support for the Q-Block1 and Q-Block2 Options.
- Further lessons learned highlighted as "Implementation note" in the document.

> Happy to have read Colin Perkins' review for the Transport ART, which
> has provided me with some confidence in this brand new transport
> protocol. I am also trusting the TSV Area Directors on this point.
> -- Section 1 --
> I had in mind that constrained network are well protected either at
> layer-2 or by having an air-gap or firewall at their edges, so, a DoS
> seems quite improbable in those deployments.

[Med] One side note: there were reports of "weak" implementations and deployments. You may refer for example to or Of course, there are guards out there but deployments may not support them. 

 Should this 'use case'
> really be part of the introduction? Or is it simply linked to the
> DOTS use case ? In either case, the DoS should be more detailed.

[Med] This is mainly driven by the DOTS use case. Not sure which more details you would like see added.   

> -- Section 3 --
> Any reason why 'CON' is not expanded/explained on first use ?

[Med] Actually, it is. Please refer to Section 1:

   As a reminder, [RFC7959]
   recommends the use of Confirmable (CON) responses to handle potential
   packet loss. 


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