Re: [core] Opsdir last call review of draft-ietf-core-hop-limit-05
Thomas Fossati <Thomas.Fossati@arm.com> Wed, 02 October 2019 16:31 UTC
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From: Thomas Fossati <Thomas.Fossati@arm.com>
To: Carsten Bormann <cabo@tzi.org>
CC: "core@ietf.org" <core@ietf.org>, Thomas Fossati <Thomas.Fossati@arm.com>
Thread-Topic: [core] Opsdir last call review of draft-ietf-core-hop-limit-05
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Date: Wed, 02 Oct 2019 16:31:17 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/core/tg_m_NuzP4usxz6unNyUxJb6iEk>
Subject: Re: [core] Opsdir last call review of draft-ietf-core-hop-limit-05
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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 IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.
- [core] Opsdir last call review of draft-ietf-core… Scott Bradner via Datatracker
- Re: [core] Opsdir last call review of draft-ietf-… mohamed.boucadair
- Re: [core] Opsdir last call review of draft-ietf-… Scott O. Bradner
- Re: [core] Opsdir last call review of draft-ietf-… Jaime Jiménez
- Re: [core] Opsdir last call review of draft-ietf-… mohamed.boucadair
- Re: [core] Opsdir last call review of draft-ietf-… Scott O. Bradner
- Re: [core] Opsdir last call review of draft-ietf-… Scott O. Bradner
- Re: [core] Opsdir last call review of draft-ietf-… Carsten Bormann
- Re: [core] Opsdir last call review of draft-ietf-… Scott O. Bradner
- Re: [core] Opsdir last call review of draft-ietf-… mohamed.boucadair
- Re: [core] Opsdir last call review of draft-ietf-… Carsten Bormann
- Re: [core] Opsdir last call review of draft-ietf-… Carsten Bormann
- Re: [core] Opsdir last call review of draft-ietf-… Thomas Fossati
- Re: [core] Opsdir last call review of draft-ietf-… mohamed.boucadair
- Re: [core] Opsdir last call review of draft-ietf-… mohamed.boucadair