Version 7 (modified by pthubert@…, 4 years ago) (diff)


The following INT working groups met at the IETF 103 in Bangkok

6lo 6man 6tisch dmm dnssd homenet intarea ipwave lpwan lwig ntp


DPRIVE did not meet at IETF103, but are planning an interim in early December 2018.


Chairs: Mohit Sethi, Zhen Cao

The Light-Weight Implementation Guidance (LWIG) Working Group met on November 7, 2018 for 1 hour. We ran out of time at the end but still managed to cover all the agenda items.

  • Chairs gave a status update on the various drafts in the working group. In addition to discussing new and existing documents, there was a discussion on draft-ietf-lwig-cellular-06. The draft has been in the RFC editors queue for > 1000 days because of a MISSREF. There was consensus in the room to wait and see if a last call is issued for the missing normative reference. Otherwise the working group might consider pulling the document back from the RFC editors queue to investigate if the normative reference is necessary (and if any other updates are required).
  • draft-ietf-lwig-tcp-constrained-node-networks-04 was presented by Carlos. The working group draft describes how to implement light-weight TCP on small devices. This draft was also presented in the TCPM working group. The draft received plenty of new feedback both during the LWIG and the TCPM sessions. Ilpo Järvinen sent another detailed review on the mailing list after the working group session. The authors now plan to update the document based on the latest round of comments and we might issue a WGLC if all the reviews are adequately addressed.
  • draft-ietf-lwig-nbr-mgmt-policy-02 was presented by Rahul. The draft describes a neighbor management policy for RPL based 6LoWPAN networks. The working document was updated based on an early review by the chair. The authors already have a proprietary implementation and are working to also have an open source implementation with the Contiki OS folks. There was discussion on splitting the document given that some of the recommendations only apply to specific scenarios and are not generally applicable. The room however had consensus to keep the current document structure.
  • There was an interesting presentation on performance of 6lo fragment forwarding by Rahul. This work was also presented in 6lo. Based on this performance report, we expect an update to the working group document on virtual reassembly buffers in 6LoWPAN (draft-ietf-lwig-6lowpan-virtual-reassembly-00).
  • draft-ietf-lwig-curve-representations-01 was remotely presented by Rene. The working group draft provides guidelines for developers implementing standard ECC curves such as NIST P-256 and EdDSA25519 and x25519 on small devices. Implementations of the recommendations in the draft already exist. We are now waiting from more reviews from crypto experts in the crypto expert review panel (Alexey Melnikov has promised to help on this).

All in all, a successful and productive meeting. Thanks to Suresh for guiding us. We continue in Prague.


During IETF103, the 6TiSCH WG has 1 WG meeting and 2 side meetings.

The WG meeting covered 5 drafts:

  • draft-ietf-6tisch-architecture is almost ready. Pascal pushed -16 before the meeting. Pascal will merge draft-ietf-6tisch-terminology into draft-ietf-6tisch-architecture and publish -17. WGLC will be called and authors of the key 6TiSCH draft will be asked to review.
  • rfc8480 was published.
  • draft-ietf-6tisch-msf was covered through 3 presentations: an intro and two "lessons learnt" presentations by 2 implementors (one by simulation using the 6TiSCH simulator, one by experimentation using OpenWSN). Performance is very good and matches the expectations, some lessons learnt already captured in Appendix E of draft-ietf-6tisch-msf. Authors will update the document based on these lessons learnt and ensure with implementors that all lessons learnt have been captured.
  • draft-ietf-6tisch-minimal-security is almost ready. It received 7 reviews during the last WGLC, all of which have been integrated, and which reviewers approve. Two final changes are still needed. Editor will discuss those on the ML, integrate them into a new version of the draft if consensus. Chairs will then open a 1-week WGLC only on those changes.
  • draft-tiloca-6tisch-robust-scheduling is new out-of-charter work which proposes a "cell shuffling" solution to prevent a selective jamming attack. The presentation was well received, the author are asked to provide more arguments about the importance of such attack.

The first side meeting was bar BoF "Predictable and Available Wireless", organized by Pascal Thubert, in which we discusses the opportunity to apply 6TiSCH to other physical layers, in particular 802.11 WiFi?. Discussions are continuing on a new mailing list

The second side meeting was called to discuss EDHOC (draft-selander-ace-cose-ecdhe) and was attended by Jim Schaad (ace co-chair), Roman Danyliw (ace and secdispatch co-chair), Goran Selander, Francesca Palombini (EDHOC authors), Malisa Vucinic (6TiSCH security), Pascal Thubert and Thomas Watteyne (6TiSCH co-chairs). It was agreed that draft-selander-ace-cose-ecdhe would go through the secdispatch process to find the right home for it. The 6TiSCH WG agreed to produce a requirements document in end-of-year, and present that to a secdispatch interim meeting which will be held in January 2019.


The LPWAN Working Group met on Thursday, 19th of July for 2.5 hours and followed its agenda as scheduled with no particular issue. In general, the main points of discussions were SCHC-over-FOO and the WGLC2 of SCHC UDP/IP, which ends with success for the Compression part, with the Fragmentation part needing some editorial work on the text.

  • Chairs opened the session with a status of the WG and next steps with rechartering.
  • Dominique Barthel presented the work at the hackathon, with the ease to introduce SCHC to newcomers. Linux-based SCHC implementation is planned for future hackathons.
  • SCHC IP/UDP editors Dominique Barthel and Ana Minaburo presented the WGLC issues raised against draft-ietf-lpwan-ipv6-static-context-hc. The work done in the past months was summarized and the process of starting a second WGLC to confirm these changes was given. The use of the ticketing system to track changes/comments was appreciated. The compression section of the document is clear with only minor editorial issues. The fragmentation section did generate a long discussion on how to improve readability. The two main alternatives are improving the text (and ensuring the FSM description in the Appendix matches the text), and moving the FSM to the Normative part (and ensuring the text in Appendix matches the FSM). The workload is generally the same, and the final decision will be made after taking it to the mailing list. Partial improvement of one of the fragmentation modes (ACK-on-Error) was proposed later by Juan Carlos.
  • Laurent Toutain presented SCHC CoAP with no major changes to report (ready for WGLC after review from CORE WG). Ricardo Andreasen introduced the new section on compressing OSCORE with SCHC CoAP. The work was highly appreciated and received several comments and reviews from the authors of OSCORE.
  • Technology-specific drafts were then presented.
  • LoRaWAN: Nicolas Sornin (co-inventor of the LoRa? radio technology) presented the SCHC-over-LoRaWAN draft ( draft-petrov-lpwan-ipv6-schc-over-lorawan ). The SCHC IP/UDP draft was appreciated for the simplicity and the fragmentation technology. The way they are parametrized for LoRaWAN was presented, with as future items the request to discuss the security mode, context representation and provisioning. WG item adoption requested after the rechartering.
  • Sigfox: Juan Carlos Zuniga presented the SCHC-over-Sigfox draft ( draft-zuniga-lpwan-schc-over-sigfox ). Parametrization for Sigfox technology was given. In addition, a potential modification of one of the fragmentation modes was proposed (Ack-on-Err).
  • Edgar Ramos presented the advancements of the SCHC over NB-IoT draft. Identification of the possible placement of SCHC in the 3GPP architecture was given (such as at the Application layer, in the SCEF or everywhere we can find ROHC).
  • Charlie Perkins presented the newly submitted SCHC-over-802.15.4. He introduced the new LPWAN effort at IEEE 802.15.4 called 802.15.4w and an unpublished draft (draft-authors-lpwan-schc-802154). Suresh indicated that since this was not identified as an original 4 technologies, there is a need for information similar to that found in RFC 8376 (was draft-ietf-lpwan-overview) before we can work in that technology. The group appeared keen to add it to charter, to be discussed in the group rechartering process.
  • Then the group discussed rechartering. The same items as in IETF 102 were discussed (OAM, reshufflng of existing sub items). Additionally, IPv4 was mentioned but the group and Suresh indicated that the need for it and the required changes to SCHC ad to be documented to start with.
  • The group completed within due time.