Re: [core] Éric Vyncke's No Objection on draft-ietf-core-hop-limit-06: (with COMMENT)
<mohamed.boucadair@orange.com> Tue, 15 October 2019 08:23 UTC
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From: mohamed.boucadair@orange.com
To: "Eric Vyncke (evyncke)" <evyncke@cisco.com>, The IESG <iesg@ietf.org>
CC: "draft-ietf-core-hop-limit@ietf.org" <draft-ietf-core-hop-limit@ietf.org>, Jaime Jimenez <jaime@iki.fi>, "core-chairs@ietf.org" <core-chairs@ietf.org>, "core@ietf.org" <core@ietf.org>
Thread-Topic: Éric Vyncke's No Objection on draft-ietf-core-hop-limit-06: (with COMMENT)
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Date: Tue, 15 Oct 2019 08:23:44 +0000
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Subject: Re: [core] Éric Vyncke's No Objection on draft-ietf-core-hop-limit-06: (with COMMENT)
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Hi Eric, Please see inline. Cheers, Med > -----Message d'origine----- > De : Eric Vyncke (evyncke) [mailto:evyncke@cisco.com] > Envoyé : lundi 14 octobre 2019 16:20 > À : BOUCADAIR Mohamed TGI/OLN; The IESG > Cc : draft-ietf-core-hop-limit@ietf.org; Jaime Jimenez; core- > chairs@ietf.org; core@ietf.org > Objet : Re: Éric Vyncke's No Objection on draft-ietf-core-hop-limit-06: > (with COMMENT) > > Hello Mohamed, > > Thank you for your reply. > > Look inline for EVY> (and feel free to ignore) > > -éric > > On 11/10/2019, 09:59, "mohamed.boucadair@orange.com" > <mohamed.boucadair@orange.com> wrote: > > Hi Eric, > > Thank you for the review. > > Please see inline. > > Cheers, > Med > > > -----Message d'origine----- > > De : Éric Vyncke via Datatracker [mailto:noreply@ietf.org] > > Envoyé : vendredi 11 octobre 2019 08:41 > > À : The IESG > > Cc : draft-ietf-core-hop-limit@ietf.org; Jaime Jimenez; core- > > chairs@ietf.org; jaime@iki.fi; core@ietf.org > > Objet : Éric Vyncke's No Objection on draft-ietf-core-hop-limit-06: > (with > > COMMENT) > > > > Éric Vyncke has entered the following ballot position for > > draft-ietf-core-hop-limit-06: No Objection > > > > When responding, please keep the subject line intact and reply to all > > email addresses included in the To and CC lines. (Feel free to cut > this > > introductory paragraph, however.) > > > > > > Please refer to https://www.ietf.org/iesg/statement/discuss- > criteria.html > > for more information about IESG DISCUSS and COMMENT positions. > > > > > > The document, along with other ballot positions, can be found here: > > https://datatracker.ietf.org/doc/draft-ietf-core-hop-limit/ > > > > > > > > --------------------------------------------------------------------- > - > > COMMENT: > > --------------------------------------------------------------------- > - > > > > Thank you for the work put into this document. I have a couple of > COMMENTs > > (that I would appreciate to see a reply of yours) and one NIT. > > > > Regards, > > > > -éric > > > > == DISCUSS == > > > > == COMMENTS == > > > > -- Section 3 -- > > C.1) "Because forwarding errors may occur if inadequate Hop-Limit > values > > are used, proxies at the boundaries of an administrative domain > MAY > > be instructed to remove or rewrite the value of Hop-Limit carried > in > > received messages" Isn't this remove all usefulness of the Hop- > Limit > > option ? > > [Med] This is warranted in the next sentence: "This modification should > be done with caution in case proxy-forwarded traffic repeatedly crosses the > administrative domain boundary in a loop and so Hop-Limit detection gets > broken." > > Basically, the decision will be deployment-specific. E.g., if the > boundary proxy is the only proxy to be invoked before reaching the ultimate > CoAP endpoint, striping the option may be OK. > > EVY> still looks like defeating the whole purpose because how one proxy > would know FOR SURE that it is the last one? > [Med] This is known to the administrative entity managing the proxy; instructions are then passed to the proxy. Absent such instruction, the default behavior of a proxy is to maintain the option. > > > > C.2) table 1, suggest to state the value of the C, U, N, R properties > > [Med] The option is elective, safe-to-forward, part of the cache, and > not repeatable. So, none of C, U, N, R is marked with "x" in the table. > > EVY> LoL __ but a little unclear at first sight. Unsure whether other > documents use a "0" or "." to specify 'not-set' ? My point is that this > document should really align with others. [Med] I got that. I confirm that the document is aligned with RFC7252. Will see how to make thing more clear. > > > > -- Section 4 -- > > C.3) while I understand why a proxy should not add its own diagnostic > > information when packet should become larger than the MTU of the next > link, > > I > > wonder what will happen downstream when the MTU will be exceeded... > > [Med] The behavior of the proxy will take into account the "Path" MTU > not the link MTU: > > Note that an > intermediate proxy prepends its information only if there is enough > space as determined by the Path MTU (Section 4.6 of [RFC7252]). > ^^^^^^^^ > > With that assumption, I don't see any MTU issue when forwarding the > packet downstream. No? > > EVY> my bad, I should learn to read... > > > > > C.4) suggest to use normative language (uppercase MAY, MUST, ...) > > > > [Med] We used to have more normative language in that section but > cleaned it as a result of this WGLC comment: > > ======== > > > 3. "To ease debugging and troubleshooting, the CoAP proxy which > > > detects a loop SHOULD include its information ... Each intermediate > > > proxy involved in relaying a TBA1 (Hop Limit Reached) error message > > > SHOULD prepend its own information" - Is it really a protocol > > > violation if I want to configure my proxy not to include any > > > information? > > > > > > > [Med] It is not a protocol violation if the information is not > included - hence the SHOULD. However it makes diagnosing the issue more > difficult. > > We briefly discussed this in the interim yesterday and came to the > conclusion that having a normative requirement here isn't needed. It > seems more like a suggestion for a good quality of implementation. I > propose to remove any use of KEYWORDs here. > ========== > > > == NITS == > > > > -- Section 3 -- > > N.1) s/if a less value/if a smaller value/ ? > > [Med] Fixed. Thank you. > >
- [core] Éric Vyncke's No Objection on draft-ietf-c… Éric Vyncke via Datatracker
- Re: [core] Éric Vyncke's No Objection on draft-ie… mohamed.boucadair
- Re: [core] Éric Vyncke's No Objection on draft-ie… Eric Vyncke (evyncke)
- Re: [core] Éric Vyncke's No Objection on draft-ie… mohamed.boucadair