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Re: [Gen-art] [Lwip] Genart last call review of draft-ietf-lwig-tcp-constrained-node-networks-10

Carles Gomez Montenegro <carlesgo@entel.upc.edu> Fri, 30 October 2020 08:25 UTC

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Date: Fri, 30 Oct 2020 09:25:40 +0100
From: Carles Gomez Montenegro <carlesgo@entel.upc.edu>
To: Alissa Cooper <alissa@cooperw.in>
Cc: Linda Dunbar <linda.dunbar@futurewei.com>, lwip@ietf.org, IETF Gen-ART <gen-art@ietf.org>, draft-ietf-lwig-tcp-constrained-node-networks.all@ietf.org
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Subject: Re: [Gen-art] [Lwip] Genart last call review of draft-ietf-lwig-tcp-constrained-node-networks-10
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Hi Alissa, and Linda,

Thank you very much for your reviews!

Based on Alissa's message, we understand that no update is required
regarding Linda's comments.

Thanks,

Carles (on behalf of the authors)


> Linda, thanks for your review. I think on both points you raise what the
> document proposes is well supported given the use case. I entered a No
> Objection ballot.
>
> Alissa
>
>> On Sep 24, 2020, at 1:34 PM, Linda Dunbar via Datatracker
>> <noreply@ietf.org> wrote:
>>
>> Reviewer: Linda Dunbar
>> Review result: Almost Ready
>>
>> I am the assigned Gen-ART reviewer for this draft. The General Area
>> Review Team (Gen-ART) reviews all IETF documents being processed
>> by the IESG for the IETF Chair.  Please treat these comments just
>> like any other last call comments.
>>
>> For more information, please see the FAQ at
>>
>> <https://trac.ietf.org/trac/gen/wiki/GenArtfaq>.
>>
>> Document: draft-ietf-lwig-tcp-constrained-node-networks-10
>> Reviewer: Linda Dunbar
>> Review Date: 2020-09-24
>> IETF LC End Date: 2020-09-30
>> IESG Telechat date: Not scheduled for a telechat
>>
>> Summary:
>> This document describes the guidance on how to configure TCP parameters
>> in the
>> Constrained-Node-Networks.
>>
>> Major issues:
>> 4.1.2. recommends ECN to be used  in the Constrained Node networks. In
>> any
>> network, especially when many IoT devices are attached , the congestion
>> can be
>> very short lived. Having Constrained node supporting ECN can cause
>> traffic
>> oscillation.  In addition, not many deployed internet supports ECN, it
>> can be
>> waste of processing of the CNN nodes.
>>
>> Section 4.1.1 recommend packet size to be 1280 for IPv6 to avoid the
>> need to
>> support Path MTU Discovery. it is problematic.  There are many layers of
>> tunneling and encapsulation in today's network, (let's not even assume
>> SR), the
>> actual packet size can be much larger.  Supporting Path MTU Discovery is
>> far
>> less processing intensive than supporting ECN.
>>
>> Minor issues:
>>
>> Nits/editorial comments:
>>
>> Cheers,
>>
>> Linda Dunbar
>>
>>
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