Minutes for 6MAN at IETF-95
minutes-95-6man-1

6MAN Working Group - Buenos Aires IETF Meeting

Wednesday 6 April 2016, 10:00-12:30, Room Buen Ayre C
Chairs: Bob Hinden, Ole Troan

Minute taker: Fred Baker
Jabber Scribe:

Jabber Room: 6man@jabber.ietf.org
Meetecho: http://www.meetecho.com/ietf95/6man

Slides can be found at: https://www.ietf.org/proceedings/95/6man.html

The full recording (synchronized video, audio, slides and jabber room) of
the 6MAN WG session at IETF 95 is available at
https://ietf95.conf.meetecho.com/index.php/Recorded_Sessions#6MAN

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Agenda
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Agenda

Introduction, Agenda Bashing, Document Status, Chairs, 15 min.

Working Group Drafts
--------------------

Hop by hop header handling, draft-ietf-6man-hbh-header-handling , Fred
Baker, 15 min.

IPv6 Update/Change Implementation report, Tim Winters, 15 min.

IPv6 Specifications to Internet Standard, draft-ietf-6man-rfc2460bis ,
draft-ietf-6man-rfc4291bis , draft-ietf-6man-rfc1981bis , Bob Hinden, 45
min.

IPv6 Segment Routing Header (SRH)
draft-previdi-6man-segment-routing-header , Stefano Previdi, 15 min.

Recommendation on Stable IPv6 Interface Identifiers
draft-ietf-6man-default-iids , Alissa Cooper, 15 min.

Active Individual Drafts
------------------------

Extensions for Multi-MTU Subnets, draft-van-beijnum-multi-mtu , Mikael
Abrahamsson, 10 min

Communicating Prefix Cost to Mobile Nodes, draft-mccann-dmm-prefixcost ,
J. Kaippallimalil, 10 min.

New Individual Drafts
----------------------

Transmission of IPv6 Packets over IEEE 802.11 Networks Outside the
Context of a Basic Service Set, draft-petrescu-ipv6-over-80211p , Nabil
Benamar, 5 min.

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Introduction, Agenda Bashing, Document Status, Chairs, 15 min.
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Chairs thanked Brian Haberman for his years of service to the IETF as an
Internet Area Directory and earlier stint as 6MAN co-chair.

Chairs reviewed the agenda, note well, summary of document status, and
document shepherding process experiment.

Hop by hop header handling, draft-ietf-6man-hbh-header-handling, Fred
Baker, 15 min.
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Tim Chown ask for an example of when inconsistent Type indicators might be
seen, Fred confirms there are some.

Dave Thaler suggest some changes in the wording of the draft.

-> If a node was compliant with RFC 2460, it should not be declared
   non-compliant in this update.  This should be more permissive, not
   less.
-> This could be done with appropriate wording that is still in line with
   the intent expressed on the slides.

Michael Richardson via meetcheco. Treat all the options as ignored.

Ron Bonica. Two issues. What legacy options we have, what has been
specify but never deployed. No rolling extensions, the maximum size may
be need to be smaller.

Authors will update draft based on presentaiton and discussion.

IPv6 Update/Change Implementation report, Tim Winters, 15 min.
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Report by UNH on implementation of the rfc2460bis and rfc4291bis drafts

 Flow Label forwarded by default? All routers were conferment and interoperated.

 Hop Limit now properly decremented.

 Handling of PMTU < 1280; no conformance issue since the discussion is removed

 HBH is now universally conferment

 Overlapping fragments

 EUI-64 - most implementations still using MAC address basis.  Embedded
 Linux can only use EUI-64, need to find a way to address that

 1981-bis interface IDs: ditto

 Could not figure out how to detect 7371 change in an address.  In other
 words, found compliance issues but not interoperability problems.

Mark Townsley: the two implementations that do privacy account for a
large portion of the traffic on the internet

Barbara Stark: Any issues with windows 10 regarding 6to4 and ISATAP.

Overall summary: No interoperability issues were found with the updated
documents.  Recommends backing out RFC7371 changes to rfc4291bis based on
lack of implementations.

IPv6 Specifications to Internet Standard, draft-ietf-6man-rfc2460bis,
draft-ietf-6man-rfc4291bis , draft-ietf-6man-rfc1981bis , Bob Hinden, 45
min.
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draft-ietf-6man-rfc2460bis

Discussion at mike about advancement of RFC 4443 (ICMPv6) without
updating in RFC 4884, 4941, and 3596. While there are issues, no change
was recommended.

Mark Townsley argued for leaving the ambiguity of whether header lengths
can be changed or headers inserted. Bob Hinden argues that he is
clarifying based on original intent. Mark argues that it should be based
on experience, which we don't have on extension headers. Fernando Gont
argued in favor of removing ambiguity. Discussion to be taken to the list
as closure is not being reached.

draft-ietf-6man-rfc4291bis

RFC 7371 update will be removed from 4291bis, as not testable or tested.

Take to the list if stable addresses are required in RFC4941 and if
RFC4941 needs to be updated before advancement to Internet Standard.

draft-ietf-6man-rfc1981bis

Proposed changes (Packetization, removal of text regarding small MTU)
seemed acceptable.

Dave Thalor suggesting clarify the text to make it clear that nodes that
don't decrement the hop limit can send ICMP Packet Too Big messages.

IPv6 Segment Routing Header (SRH)
draft-previdi-6man-segment-routing-header, Stefano Previdi, 15 min.
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Implementation approaches (2) follow both the header insertion model and
the encapsulation model.

Extensions for Multi-MTU Subnets, draft-van-beijnum-multi-mtu , Mikael
Abrahamsson, 10 min
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Discussed at IETF 69, 71, and 78.

David Lamparter: suggest doing this for link-local addresses on the basis
of per-link-local-per-interface.

Mark Townsley: really need PMTUD, still have issues about header insertion.

Recommendation on Stable IPv6 Interface Identifiers
draft-ietf-6man-default-iids, Alissa Cooper, 15 min.
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Various IPv6/foo documents recommend use of a MAC address or other value
in a link local address. This draft updates them all to prefer RFC 7217
as the mechanism for generating stable addresses.

Dave Thaler wants further discussion

Erik Nordmark thinks what we have is fine, and that we need to push
toward running code. Suggestion: if an interface is known to be
randomizing its MAC address, something akin to perfect forward secrecy
might be helped by changing the IPv6 address when the MAC changes its
address.

Dave Thaler. The mac address randomization belongs to the other document.

Tim Chown generally supports the draft.

Communicating Prefix Cost to Mobile Nodes, draft-mccann-dmm-prefixcost,
J. Kaippallimalil, 10 min.
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Also being presented in the MIF w.g.

Transmission of IPv6 Packets over IEEE 802.11 Networks Outside the
Context of a Basic Service Set, draft-petrescu-ipv6-over-80211p , Nabil
Benamar, 5 min.
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Erik Nordmark. How frequent is very frequent ? Miliseconds.

Announcing a BOF.

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Meeting Adjourned
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