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

Alissa Cooper <alissa@cooperw.in> Thu, 22 October 2020 13:40 UTC

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From: Alissa Cooper <alissa@cooperw.in>
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Date: Thu, 22 Oct 2020 09:40:26 -0400
Cc: IETF Gen-ART <gen-art@ietf.org>, draft-ietf-lwig-tcp-constrained-node-networks.all@ietf.org, lwip@ietf.org
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To: Linda Dunbar <linda.dunbar@futurewei.com>
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Subject: Re: [Gen-art] Genart last call review of draft-ietf-lwig-tcp-constrained-node-networks-10
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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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