Re: [ipwave] Éric Vyncke's Discuss on draft-ietf-ipwave-vehicular-networking-28: (with DISCUSS and COMMENT)
"Eric Vyncke (evyncke)" <evyncke@cisco.com> Sat, 25 June 2022 07:08 UTC
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From: "Eric Vyncke (evyncke)" <evyncke@cisco.com>
To: "Mr. Jaehoon Paul Jeong" <jaehoon.paul@gmail.com>, Roman Danyliw <rdd@cert.org>
CC: Lars Eggert <lars@eggert.org>, Alvaro Retana <aretana.ietf@gmail.com>, Murray Kucherawy <superuser@gmail.com>, Paul Wouters <paul.wouters@aiven.io>, "Rob Wilton (rwilton)" <rwilton@cisco.com>, Daniel Migault <daniel.migault@ericsson.com>, The IESG <iesg@ietf.org>, "its@ietf.org" <its@ietf.org>, skku-iotlab-members <skku-iotlab-members@googlegroups.com>
Thread-Topic: [ipwave] Éric Vyncke's Discuss on draft-ietf-ipwave-vehicular-networking-28: (with DISCUSS and COMMENT)
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Date: Sat, 25 Jun 2022 07:07:58 +0000
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Subject: Re: [ipwave] Éric Vyncke's Discuss on draft-ietf-ipwave-vehicular-networking-28: (with DISCUSS and COMMENT)
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Paul, Sorry for belated reply, your revision letter seems to address all my DISCUSS and most of my COMMENTs (still remaining the non-blocking COMMENT in section 6.1 about using IPv6 SEND to protect against DAD flooding – non blocking so you can safely ignore it). As soon as the revised I-D is uploaded with the proposed changes, then I am clearing my DISCUSS. Regards -éric From: "Mr. Jaehoon Paul Jeong" <jaehoon.paul@gmail.com> Date: Saturday, 25 June 2022 at 04:11 To: Eric Vyncke <evyncke@cisco.com>, Roman Danyliw <rdd@cert.org> Cc: Lars Eggert <lars@eggert.org>, Alvaro Retana <aretana.ietf@gmail.com>, Murray Kucherawy <superuser@gmail.com>, Paul Wouters <paul.wouters@aiven.io>, "Rob Wilton (rwilton)" <rwilton@cisco.com>, Daniel Migault <daniel.migault@ericsson.com>, The IESG <iesg@ietf.org>, "its@ietf.org" <its@ietf.org>, skku-iotlab-members <skku-iotlab-members@googlegroups.com>, "Mr. Jaehoon Paul Jeong" <jaehoon.paul@gmail.com> Subject: Fwd: [ipwave] Éric Vyncke's Discuss on draft-ietf-ipwave-vehicular-networking-28: (with DISCUSS and COMMENT) Hi Éric and Roman, Though you guys seem very busy with other stuffs, could you check whether my revision is satisfying your DISCUSS or not? I hope this IPWAVE PS draft moves forward and IPWAVE WG will be able to take the next step. Thanks. Best Regards, Paul ---------- Forwarded message --------- From: Mr. Jaehoon Paul Jeong <jaehoon.paul@gmail.com<mailto:jaehoon.paul@gmail.com>> Date: Sat, Jun 11, 2022 at 12:02 AM Subject: Re: [ipwave] Éric Vyncke's Discuss on draft-ietf-ipwave-vehicular-networking-28: (with DISCUSS and COMMENT) To: Éric Vyncke <evyncke@cisco.com<mailto:evyncke@cisco.com>>, Lars Eggert <lars@eggert.org<mailto:lars@eggert.org>>, Roman Danyliw <rdd@cert.org<mailto:rdd@cert.org>>, Alvaro Retana <aretana.ietf@gmail.com<mailto:aretana.ietf@gmail.com>>, Murray Kucherawy <superuser@gmail.com<mailto:superuser@gmail.com>>, Paul Wouters <paul.wouters@aiven.io<mailto:paul.wouters@aiven.io>>, Robert Wilton <rwilton@cisco.com<mailto:rwilton@cisco.com>>, Daniel Migault <daniel.migault@ericsson.com<mailto:daniel.migault@ericsson.com>> Cc: The IESG <iesg@ietf.org<mailto:iesg@ietf.org>>, Pascal Thubert <pthubert@cisco.com<mailto:pthubert@cisco.com>>, CARLOS JESUS BERNARDOS CANO <cjbc@it.uc3m.es<mailto:cjbc@it.uc3m.es>>, <its@ietf.org<mailto:its@ietf.org>>, Chris Shen <shenyiwen7@gmail.com<mailto:shenyiwen7@gmail.com>>, skku-iotlab-members <skku-iotlab-members@googlegroups.com<mailto:skku-iotlab-members@googlegroups.com>>, Mr. Jaehoon Paul Jeong <jaehoon.paul@gmail.com<mailto:jaehoon.paul@gmail.com>> Hi Éric, Roman, Lars, Alvaro, Murray, Paul, Robert, and Daniel, Let me remind you of the revision of the IPWAVE Problem Statement Draft: https://datatracker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-networking-29 Zahed gave me his comment, and I will reflect it on version -30. Could you review my revision on your comments and update your position as soon as possible? Thanks for your valuable comments and help. Best Regards, Paul On Fri, May 20, 2022 at 4:31 AM Mr. Jaehoon Paul Jeong <jaehoon.paul@gmail.com<mailto:jaehoon.paul@gmail.com>> wrote: Hi Éric, Lars, Roman, Alvaro, Murray, Paul, Zaheduzzaman, Robert, Daniel, Here is the revision of the IPWAVE Problem Statement Draft: https://datatracker.ietf.org/doc/html/draft-ietf-ipwave-vehicular-networking-29 I attach a revision letter to explain how Chris and I have addressed your comments on the revised draft. If you have further comments or questions, please let me know. Thanks for your valuable comments and help. Best Regards, Paul -- =========================== Mr. Jaehoon (Paul) Jeong, Ph.D. Associate Professor Department Head Department of Computer Science and Engineering Sungkyunkwan University Office: +82-31-299-4957 Email: pauljeong@skku.edu<mailto:pauljeong@skku.edu>, jaehoon.paul@gmail.com<mailto:jaehoon.paul@gmail.com> Personal Homepage: http://iotlab.skku.edu/people-jaehoon-jeong.php<http://cpslab.skku.edu/people-jaehoon-jeong.php> On Wed, Apr 6, 2022 at 3:30 PM Éric Vyncke via Datatracker <noreply@ietf.org<mailto:noreply@ietf.org>> wrote: Éric Vyncke has entered the following ballot position for draft-ietf-ipwave-vehicular-networking-28: Discuss 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/about/groups/iesg/statements/handling-ballot-positions/ for more information about how to handle DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-ipwave-vehicular-networking/ ---------------------------------------------------------------------- DISCUSS: ---------------------------------------------------------------------- Thank you for the work put into this document. I found the use cases part of section 3.1 very interesting to read even if some of them seem very far fetched ;-) Please find below some blocking DISCUSS points (easy to address though), some non-blocking COMMENT points (but replies would be appreciated even if only for my own education), and some nits. Special thanks to - Carlos Bernardos for the shepherd's write-up even if a justification for the informational status would have been welcome but the WG consensus description is appreciated. - Pascal Thubert for his IETF last call INT directorate review at: https://datatracker.ietf.org/doc/review-ietf-ipwave-vehicular-networking-20-intdir-lc-thubert-2021-06-18/ and for his IESG telechat INT directorate review https://datatracker.ietf.org/doc/review-ietf-ipwave-vehicular-networking-27-intdir-telechat-thubert-2022-02-28/ Pascal's Last Call & telechat reviews were (at least partially) acted upon by Paul ;-) I hope that this helps to improve the document, Regards, -éric # DISCUSS As noted in https://www.ietf.org/blog/handling-iesg-ballot-positions/, a DISCUSS ballot is a request to have a discussion on the following topics: ## Abstract & Section 1 "then enumerates requirements for the extensions of those IPv6 protocols" does not match any IPWAVE WG work item, i.e., it is outside the scope of the charter of IPWAVE WG. As the document does not explicitly specify requirements, I strongly suggest to use the word "gaps" rather than "requirements" in the abstract and section 1. ## Section 4.1 Using an IPv6 address out of a ULA prefix still requires DAD. So the text below should be updated to be corrected: "their own IPv6 Unique Local Addresses (ULAs) [RFC4193] over the wireless network, which does not require the messaging (e.g., Duplicate Address Detection (DAD)) of IPv6 Stateless Address Autoconfiguration (SLAAC) [RFC4862]." ## Section 4.2 Very similar comment as above (i.e., DAD & MLD must be done for all IPv6 addresses of an interface and not only for the global one): "... When global IPv6 addresses are used, wireless interface configuration and control overhead for DAD" ## Section 5.2 "... If DHCPv6 is used to assign a unique IPv6 address to each vehicle in this shared link, DAD is not required. " This is incorrect and must be changed (see section 18.2.10.1. of RFC 8415) ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- # COMMENTS "100km/h as the speed limit in highway" will make many European drivers smile as it is really slow... ## Section 1 "Most countries and regions in the world have adopted the same frequency allocation for vehicular networks." but there are TWO frequency allocations described just before, so, which one has been adopted ? ## Section 2 "GPS" is just the USA commercial example of the more generic "global navigation satellite system" (GNSS), GNSS should be used in this document. As IP-RSU have at least 2 interfaces, should "Also, it may have *the* third IP-enabled wireless interface" be replaced by "Also, it may have *a* third IP-enabled wireless interface" ? LiDAR ... "by measuring the reflected pulsed light" but on which kind of metrics ? ## Section 3.1 Should the 1st and 5th bullets be grouped together ? Please describe "UAM" (e.g., in the terminology section) as it is unclear to the reader whether it is a crewed / uncrewed aircraft. If both road and air vehicles are use case, what about river / sea ships or trains ? Does the paragraph about "reward system" belong to the use case ? It rather sounds like a business requirement. Suggest to remove this part. Like written by Pascal Thubert in his telechat review, the last paragraph "IPv6-based packet exchange and secure" should be clear that this is not only about data plane traffic but also control plane L2/L3 ones. Please also use the Oxford comma, i.e., add a "," after "exchange". ## Section 3.2 Suggest to also mention "5G" after "IP-RSU or 4G-LTE networks" How is the UAM use case different from a driverless terrestrial EV ? Suggest to merge those use cases. ## Section 4.1 As noted by other ADs, "Existing network architectures," the list should not include OMNI yet as it is not deployed and would probably not be described as an architecture. "the wireless media interfaces are autoconfigured with a global IPv6 prefix", is it the same shared prefix or multiple prefixes ? Is "RSU" the same concept as "IP-RSU" ? The last paragraph is about TCP session continuity, but does not explain why multi-path TCP or QUIC session resumption cannot be used. ## Section 4.2 The computation about "dwell time" is interesting even if it is computed in the best case. But, I really wonder whether using IPv6 and routing are applicable to the use case as opposed to more layer-2 + tunnel solutions (like 3GPP) with such short time for hand-over. I am a strong supporter of layer-3 (IPv6 and routing), but I cannot refrain from thinking that IPv6 is the wrong technical solution for those use cases... Was this discussed in the WG ? ## Section 5.1 What is "legacy DAD" ? "...the NA interval needs to be dynamically adjusted according to a vehicle's speed so that the vehicle can maintain its neighboring vehicles in a stable way" With the issues linked to multicast over wireless, are the authors and the WG sure that increasing the amount of multicast will not aggravate the problem ? See RFC 9119 (cited as a normative down reference) ## Section 5.1.2 Please add some references to the MADINAS WG current work items. The authors may also consider adding this use case to the MADINAS use case. "The pseudonym of a MAC address affects an IPv6 address based on the MAC address", nearly no implementations use EUI-64 anymore so this part should probably be removed from the document. But, the change of MAC address probably has other impact on the IP stack, e.g., the neighbour cache. ## Section 5.1.3 AFAIK, RPL relies on messages to discover the topology and I am afraid that in such a moving / dynamic environment, there will be too many of RPL messages. Will RPL scale in this ever changing network ? Please note that I am not a RPL expert. ## Section 6.1 Some explanations on how SEND protects against DAD flooding would be welcome. Is "classical IPv6 ND" the same as the previously used "legacy ND" ? Wondering why "Vehicle Identification Number (VIN)" is suggested to be used as SubjectAltName in a certificate rather than a car manufacturer cert ? ## Section 6.3 The part about bitcoin and blockchain errs probably too far away from the IETF remit. ## Appendix B I fail to understand how RPL and OMNI can be compared as they are vastly different technologies (routing vs. tunneling). "In OMNI protocol, each wireless media interface is configured with an IPv6 Unique Local Address (ULA)" but from my last read of OMNI drafts (1+ year ago), the OMNI virtual interface can have a ULA indeed but the wireless physical ones are using any prefix. ## Appendix D What will be the impact of high packet loss rate (that I am expecting on such networks) on IP parcels ? # NITS Please check that all IPv6 addresses are in lowercase (e.g., in section 4.1). _______________________________________________ its mailing list its@ietf.org<mailto:its@ietf.org> https://www.ietf.org/mailman/listinfo/its
- [ipwave] Éric Vyncke's Discuss on draft-ietf-ipwa… Éric Vyncke via Datatracker
- Re: [ipwave] Éric Vyncke's Discuss on draft-ietf-… Mr. Jaehoon Paul Jeong
- Re: [ipwave] Éric Vyncke's Discuss on draft-ietf-… Zaheduzzaman Sarker
- Re: [ipwave] Éric Vyncke's Discuss on draft-ietf-… Mr. Jaehoon Paul Jeong
- Re: [ipwave] Éric Vyncke's Discuss on draft-ietf-… Zaheduzzaman Sarker
- Re: [ipwave] Éric Vyncke's Discuss on draft-ietf-… Mr. Jaehoon Paul Jeong
- [ipwave] Fwd: Éric Vyncke's Discuss on draft-ietf… Mr. Jaehoon Paul Jeong
- Re: [ipwave] Éric Vyncke's Discuss on draft-ietf-… Eric Vyncke (evyncke)
- Re: [ipwave] Éric Vyncke's Discuss on draft-ietf-… Mr. Jaehoon Paul Jeong