Minutes IETF125: 6man: Wed 06:00
minutes-125-6man-202603180600-01

Meeting Minutes IPv6 Maintenance (6man) WG
Date and time 2026-03-18 06:00
Title Minutes IETF125: 6man: Wed 06:00
State Active
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Last updated 2026-04-08

minutes-125-6man-202603180600-01

6MAN Working Group - IETF 125 Shenzhen

Wednesday, 18 March 2026, 14:00-16:00 (UTC+8)

Room: Shangri La Ballroom 1
Chairs: Bob Hinden, Jen Linkova
Minute taker: EKR AI Tool, edited by w.g. chairs
Jabber Scribe: N/A

Jabber Room: 6man@jabber.ietf.org

Meetecho (Full Client):
https://meetings.conf.meetecho.com/ietf125/?session=35086

Meetecho (Onsite Tool):
https://meetings.conf.meetecho.com/onsite125/?session=35086

Agenda Wednesday, 18 March 2026, 14:00-16:00 (UTC+8)

  • Introduction, Agenda Review, and Document Status , Chairs, 10 min.

Working Group Drafts

This is a summary of the 6man Working Group session held during IETF 125
in Shenzhen China. It was produced by the automated minute tool
(https://ietfminutes.org/about.html) written by Eric Rescorla
ekr@rtfm.com. It was edited by the chairs after the meeting.

Summary

The 6MAN Working Group met at IETF 125 in Shenzhen China. The session
was chaired by Jen Linkova and Bob Hinden (both participating remotely),
with Erik Vyncke acting as the on-site chair. The meeting marked a
leadership transition as Eric Kline stepped down as the responsible Area
Director (AD), with Erik Vyncke taking over the role. The agenda covered
four working group documents and five individual presentations, focusing
on neighbor discovery, extension header security, and routing-related
ICMP behavior.

Key Discussion Points

Introduction and Document Status

  • AD Transition: Eric Kline is finishing his term; Erik Vyncke is
    the new responsible AD for 6MAN.
  • MISREF Issues: Several drafts (including
    draft-ietf-6man-rfc6724-bis) are held in the RFC Editor Queue due
    to a normative reference to a SNAC draft. The ADs and chairs
    discussed potentially changing the SNAC reference to "informative"
    to unblock the queue. Draft will be sent back to w.g. to revise,
    then repeat w.g. last call and advance.
  • draft-ietf-6man-slaac-renum: Lorenzo Colitti raised concerns
    that the current draft could cause battery drain on mobile devices
    by sending too many Router Advertisements (RAs) during renumbering.
    The draft will be returned to the working group for revision.
  • draft-ietf-6man-sidlist-clarification, Erik Kline volunteered to
    be document shephard.

Working Group Drafts

Individual Presentations

  • The IPv6 Loopback Address Prefix

    • Presenter: Jen Linkova (on behalf of authors)
    • Discussion: The proposal to expand the loopback prefix to
      ::/96 met significant resistance. Brian Carpenter and Jen
      Linkova expressed concerns about overlapping with the
      unspecified address (::). Lorenzo Colitti noted the utility of
      multiple loopback addresses but questioned the specific prefix
      choice.

  • Addressing Extension Header Vulnerabilities

    • Presenter: Tom Herbert
    • Discussion: This covered four distinct ideas: enforcing EH
      ordering/occurrence, "obsoleting" certain EHs on the public
      internet, removing EHs at egress, and restricting Destination
      Options locations.
    • Feedback: Lorenzo Colitti noted that fragmentation cannot be
      deprecated because DNS relies on it. Ron Bonica supported
      enforcing ordering/occurrence rules as "MUSTs" but opposed
      middlebox modification/removal of headers. Comment that we need
      to be careful to not limit future flexability.

  • Updates to DNS64 Functionality Advertisement for DNS RA
    Option

    • Presenter: Chenhao
    • Discussion: The proposal adds a "T" flag to RDNSS to
      indicate DNS64 capability. Jordi Palet and Lorenzo Colitti
      argued that existing tools (like separate APNs or
      ipv4only.arpa lookups) already solve the stated use cases
      without protocol changes.

  • ICMP Error Handling for VPNs in SRv6 Networks

    • Presenter: Balaji Venkat Venkataswami
    • Discussion: The draft addresses how to return ICMP errors to
      VPN endpoints in an SRv6 network without requiring P-nodes to be
      VPN-aware. Suresh Krishnan suggested the work might better
      belong in the SPRING WG. Ron Bonica supported the technical
      approach of not involving the tunnel egress.

Decisions and Action Items

  • draft-ietf-6man-slaac-renum: Will be returned to 6MAN. Authors
    must revise the draft to address battery consumption concerns
    (specifically the frequency/count of RAs sent during renumbering)
    before advancing.
  • draft-ietf-6man-rfc8504-bis: Authors to update references
    (including RFC 8899) and finalize the revert of EH limit text to
    match RFC 8504.
  • draft-ietf-6man-yang-data-model-for-ipv6-neighbor-discovery:
    Chairs will initiate WGLC following the meeting.
  • SNAC MISREF: ADs (Erik Vyncke and Eric Kline) will investigate
    if the normative dependency on the SNAC draft can be downgraded to
    informative to unblock draft-ietf-6man-rfc6724-bis and the RA-Flag
    draft.

Next Steps

  • Liaison Statement: David Schinazi and Suresh Krishnan will
    coordinate a liaison statement to the IEEE regarding
    draft-ietf-6man-ieee80211-fms.
  • draft-ietf-6man-enhanced-vpn-vtn-id: Continued discussion on
    the mailing list regarding ID length flexibility.
  • Individual Drafts: Authors of the Loopback and DNS64 RA drafts
    were encouraged to refine their problem statements and consult the
    V6OPS working group for operational consensus.
  • SRv6 ICMP: Chairs from 6MAN and SPRING will discuss the
    appropriate home for this work.

Meeting adjourned