Re: [core] Opsdir last call review of draft-ietf-core-hop-limit-05

<mohamed.boucadair@orange.com> Thu, 03 October 2019 06:10 UTC

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From: mohamed.boucadair@orange.com
To: Thomas Fossati <Thomas.Fossati@arm.com>, Carsten Bormann <cabo@tzi.org>
CC: "core@ietf.org" <core@ietf.org>
Thread-Topic: [core] Opsdir last call review of draft-ietf-core-hop-limit-05
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Date: Thu, 03 Oct 2019 06:10:14 +0000
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Subject: Re: [core] Opsdir last call review of draft-ietf-core-hop-limit-05
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Hi Thomas, all,

Now that the WG went for a "MUST", I think that your proposed wording is much better. 

Cheers,
Med

> -----Message d'origine-----
> De : core [mailto:core-bounces@ietf.org] De la part de Thomas Fossati
> Envoyé : mercredi 2 octobre 2019 18:31
> À : Carsten Bormann
> Cc : core@ietf.org
> Objet : Re: [core] Opsdir last call review of draft-ietf-core-hop-limit-05
> 
> Hi Carsten,
> 
> [trimming the CC list to CoRE only]
> 
> On 02/10/2019, 16:47, "core on behalf of Carsten Bormann" <core-
> bounces@ietf.org on behalf of cabo@tzi.org> wrote:
> > In the CoRE Virtual Interim we just had (minutes to be posted), we
> > said that the WG wouldn’t have a problem with changing the “are
> > expected to” (implement and default-enable) in Section 1.1 into a
> > stronger MUST.  This would still leave the option for a Proxy operator
> > to turn off the use of the Option, i.e., a receiver cannot rely on
> > actually receiving it.  Let’s wait for the ADs to chime in on that…
> 
> Having thought a bit more on the specific change that was discussed
> during the interim:
> 
>    CoAP proxies that do not have specific knowledge that proxy
>    forwarding loops are avoided in some other way, MUST
>    implement this option and have it enabled by default.
> 
> I think this should be tweaked further.
> 
> How I read the sentence is: "You can't deploy a proxy box that can
> potentially be part of a forwarding loop, if that box is not able to
> understand and process the option."
> 
> Trouble is that the conditional clause looks implausible in general - it
> seems to presume divination skills.
> 
> If we want this option to be part of the future CoAP ecosystem (which I
> think is a good thing), we should just say something like:
> 
>    Newly deployed CoAP proxies MUST implement this option and have it
>    enabled by default.
> 
> One of the good properties about this option IIUC is that even one
> implementer can make a difference -- i.e., you don't need fork-lift
> upgrades to start getting some benefit.
> 
> Cheers, t
> 
> 
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