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IETF-99 dhc minutes

Session 2017-07-19 1330-1500: Athens/Barcelona - Audio stream - dhc chatroom

Minutes

minutes-99-dhc-04 minutes



          DHC WG minutes for IETF-99 Prague (DRAFT)
          
          Date: Wednesday, July 19, 2017, 13:30-15:00 (CEST)
          Location: Athens/Barcelona
          Chairs: Tomek Mrugalski & Bernie Volz
          
          
          1. The meeting had started with co-chairs (Bernie Volz and Tomek
          Mrugalski) going through the agenda and summarizing the state of the
          game (two RFCs 8156, 8168 being published, with another one in RFC-Ed
          queue).
          
          2. John Brzozowski delivered an excellent presentation about DHCPv6
          deployment at Comcast, which is one of the biggest production networks
          that use DHCPv6. The scope of this deployment (devices counted in tens
          of millions) was of particular interest to the WG. 99% of 44 million
          cable modems is using IPv6 and 90% of them are v6-only. As John said
          "The scale doubled over the years. Every day is a first". Some details
          of specific mechanisms were shared: IA_NA and IA_PD are used, with CPE
          getting /56 prefix, splits to /58s or /60s. There are plans to retire
          IA_NA and use PD only. SLAAC is everywhere on home networks, with some
          gateways doing stateful as well. Intention is to deploy rapid-commit
          to optimize traffic. No specific protocol issues reported, but there
          may be some operational experience draft coming.
          
          3. Tomek Mrugalski presented Secure DHCPv6 update -
          draft-ietf-dhc-sedhcpv6. We did conclude a WGLC since previous meeting,
          but serious objections were raised. On technical level the solution
          was almost workable, but as preparation for a hackathon serious
          questions were raised that quickly escalated into discussion about
          base assumptions. Bernie and Tomek discussed the matter with
          co-authors and Sec AD, and came up with several possible ways forward:
          a) fix the key signing issue, publish as experimental; b) scope down
          to just do opportunistic encryption; c) step back and do a problem
          statement draft first; d) drop the work.  It became very clear that
          going with the experimental publication route was not favored by
          anyone, so quickly discarded. People in the room cared about the
          security, so dropping the work was discarded as well.  Suresh
          Krishnan (responsible Int AD) was ok with dropping the work, but was
          also fine with going with the problem statement.  Kathleen Moriarty
          (Sec AD) asked whether the DHC needs help. The ipsec WG is small, but
          it's full of experts. Also pointed out that the threat analysis is
          typically done by the WG. Discussion evolved around the question of
          whether opportunistic encryption could be achieved with IPSec. The
          major problem here is that DHCPv6 uses deployed relay agents that
          can't really be modified and clients communicate with relays using
          multicast. It was not immediately clear whether IPSec can handle that
          or not.
          
          It is clear that 3315bis and its security considerations section
          requires some additional work.
          
          4. Srinivasa Rao Nallurim presented DHCP/DHCPv6 options for LWM2M
          bootstrapping (draft-nalluri-dhc-dhcpv6-lwm2m-bootstrap-options),
          which was a first remote presentation in DHC in a very long time. It
          went well. Some concerns were raised by Francis Dupont, who pointed
          out that the text about storing a certificate requires clarification.
          
          People in the room were generally in favor of the concept. There are no
          WGs dedicated to this work. Chairs asked Suresh, as responsible AD,
          that it would be ok to adopt this work in DHC. An adoption call will be
          announced soon.
          
          5. Danny Moses presented OnDemand Extensions to DHCPv6 for IP Session
          Continuity Requests (draft-moses-dmm-dhcp-ondemand-mobility,
          draft-ietf-dmm-ondemand-mobility). This is a work being done in the
          DMM WG and was presented in DHC to provide background information and
          ask for a review. Some discussion ensued with the option formats
          looking good. There was a question whether anchor preference option is
          needed at all as the desired functionality could possibly be done with
          a IA_PD with hints sent using IAPREFIX option.
          
          The meeting finished almost exactly on time, taking good use of all 90
          minutes.
          
          



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