[6lo] review of https://tools.ietf.org/html/draft-ietf-6lo-use-cases-07

"Pascal Thubert (pthubert)" <pthubert@cisco.com> Tue, 08 October 2019 16:25 UTC

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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: "draft-ietf-6lo-use-cases@ietf.org" <draft-ietf-6lo-use-cases@ietf.org>
CC: "'6lo@ietf.org'" <6lo@ietf.org>
Thread-Topic: review of https://tools.ietf.org/html/draft-ietf-6lo-use-cases-07
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Date: Tue, 8 Oct 2019 16:25:17 +0000
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Subject: [6lo] review of https://tools.ietf.org/html/draft-ietf-6lo-use-cases-07
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Dear authors:

Please find some comments below.


<

    some IEEE 802.15.4 link
"
Please reword to "IEEE Std 802.15.4"  and include a reference. You may use

      <reference anchor="IEEE802154">
         <front>
            <title>IEEE Std. 802.15.4, Part. 15.4: Wireless Medium Access
            Control (MAC) and Physical Layer (PHY) Specifications for Low-Rate
            Wireless Personal Area Networks
            </title>
            <author>
               <organization>IEEE standard for Information Technology</organization>
            </author>
            <date/>
         </front>
      </reference>

Note that Thread and 6TiSCH use 6LoWPAN on 802.15.4 . This is worth mentioning. Thread has nice lighting use cases.


I do not see text on 802.11ah ? There has been 6lo work https://tools.ietf.org/html/draft-delcarpio-6lo-wlanah-01


Section 3.6 does not refer to the WIP on PLC: https://datatracker.ietf.org/doc/draft-hou-6lo-plc/


Shouldn't you have a section on Wi-Sun? see https://datatracker.ietf.org/doc/draft-heile-lpwan-wisun-overview/
Note that this is also related to RFC 8036 together with PLC, should also be discussed next to your section .6. on Smart Grid





   "

   In the G3-PLC specification, the 6lo adaptation layer utilizes the

   6LoWPAN functions (e.g. header compression, fragmentation and

   reassembly)
      "
    Are you sure of that? I thought they used RFC 8066 to do their stuff

In section 5

"

      6LoWPAN requires that IPv6 Neighbor Discovery

      for low power networks [RFC6775<https://tools.ietf.org/html/rfc6775>;] be used for autoconfiguration of

      stateless IPv6 address assignment.  Considering the energy

      sensitive networks [RFC6775<https://tools.ietf.org/html/rfc6775>;] makes optimization from classical

      IPv6 ND [RFC4861<https://tools.ietf.org/html/rfc4861>;] protocol.

"

This text is a bit off: On the one hand autoconf is defined in RFC 4862. On the other hand RFC 8505 updates RFC 6775. It forgets to mention the obvious, which is to must IPv6 (RFC 8200)
Then there's more to be said about the support of IPv6 by the 6lo node. E.g., support of host functions in RFC 8200 like the capability to ignore consumed routing headers and HbH options. This become useful when combined with RPL, and a ref to https://tools.ietf.org/html/draft-ietf-roll-useofrplinfo would be useful.
I'd suggest:

"
      6LoWPAN developed a new version of IPv6 ND [RFC 4861, RFC 4862]
     that relies on a proactive registration to avoid the use of
      multicast. 6LoWPAN ND [RFC 6775, RFC 8505] inherits from IPv6 ND
      for mechanisms such as SLAAC and NUD, but uses a unicast method
      for DAD, and avoids multicast lookups from all nodes by using
      non-onlink prefixes. A 6LN is also expected to be an IPv6 host
      per [RFC 8200] which means it should ignore consumed routing
      headers and HbH options; when operating in a RPL [RFC 6550]
      network, it is also beneficial to support IP-in-IP encapsulation
      [draft-ietf-roll-useofrplinfo]. the 6LN should also support
      RFC 8505 and use it as the default ND method.
"


Voila, great doc by the way : )

Pascal