Re: [tcpm] [Fwd: [Lwip] I-D Action: draft-ietf-lwig-tcp-constrained-node-networks-04.txt]

Hello,

I've read the draft and I think the draft looks fine and mostly ready.
I have some comments below..

1: Section 4.2.4:
  "In that case, RTO algorithm tuning may be considered, although
careful assessment of possible drawbacks is recommended"

-> It might be better if we refer draft-ietf-tcpm-rto-consider here
although it is not very certain the draft will be published at this
moment? It seems to me the motivation of the doc fits the situation
like this.

2: Section 4.3.1:
   "These algorithms work efficiently for window size of at least 5 MSS"

-> Just curious why this is 5? Is it because the use of delayed ack is presumed?
     A receiver may have a chance to send an ack for segment 1 before
segment 3 arrives.

3: Section 5.3
    CCN -> CNN?

   "This overhead could be reduced by TCP Fast Open (TFO)"

-> Yes, but the use of TLS is not mandatory in this draft. If an
implementation utilizes TFO, we might want to mention about app level
idempotency here.

   "TCP keep-alive messages are not very useful to..."

-> We don't need to discuss reducing the interval of keep-alive here?

Thanks,
--
Yoshi

On Mon, Oct 8, 2018 at 10:47 PM Carles Gomez Montenegro
<carlesgo@entel.upc.edu> wrote:
>
> Dear LWIG and TCPM WGs,
>
> As you can see below, we have updated the "TCP Usage Guidance in the
> Internet of Things (IoT)" draft.
>
> This revision intends to address previously pending TODOs, as well as
> comments from the LWIG session in Montreal.
>
> As you may recall, we are getting ready for requesting a WGLC. Your
> comments will be most welcome.
>
> Thanks,
>
> Carles (on behalf of all authors)
>
>
> ---------------------------- Original Message ----------------------------
> Subject: [Lwip] I-D Action:
> draft-ietf-lwig-tcp-constrained-node-networks-04.txt
> From:    internet-drafts@ietf.org
> Date:    Tue, October 9, 2018 7:30 am
> To:      i-d-announce@ietf.org
> Cc:      lwip@ietf.org
> --------------------------------------------------------------------------
>
>
> A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
> This draft is a work item of the Light-Weight Implementation Guidance WG
> of the IETF.
>
>         Title           : TCP Usage Guidance in the Internet of Things (IoT)
>         Authors         : Carles Gomez
>                           Jon Crowcroft
>                           Michael Scharf
>         Filename        : draft-ietf-lwig-tcp-constrained-node-networks-04.txt
>         Pages           : 25
>         Date            : 2018-10-08
>
> Abstract:
>    This document provides guidance on how to implement and use the
>    Transmission Control Protocol (TCP) in Constrained-Node Networks
>    (CNNs), which are a characterstic of the Internet of Things (IoT).
>    Such environments require a lightweight TCP implementation and may
>    not make use of optional functionality.  This document explains a
>    number of known and deployed techniques to simplify a TCP stack as
>    well as corresponding tradeoffs.  The objective is to help embedded
>    developers with decisions on which TCP features to use.
>
>
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-lwig-tcp-constrained-node-networks/
>
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-ietf-lwig-tcp-constrained-node-networks-04
> https://datatracker.ietf.org/doc/html/draft-ietf-lwig-tcp-constrained-node-networks-04
>
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=draft-ietf-lwig-tcp-constrained-node-networks-04
>
>
> Please note that it may take a couple of minutes from the time of submission
> until the htmlized version and diff are available at tools.ietf.org.
>
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>
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