Re: [6lo] Intdir telechat review of draft-ietf-6lo-plc-06

"Eric Vyncke (evyncke)" <evyncke@cisco.com> Tue, 10 August 2021 05:48 UTC

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From: "Eric Vyncke (evyncke)" <evyncke@cisco.com>
To: Dave Thaler <dthaler@microsoft.com>, "int-dir@ietf.org" <int-dir@ietf.org>
CC: "6lo@ietf.org" <6lo@ietf.org>, "draft-ietf-6lo-plc.all@ietf.org" <draft-ietf-6lo-plc.all@ietf.org>, "last-call@ietf.org" <last-call@ietf.org>
Thread-Topic: Intdir telechat review of draft-ietf-6lo-plc-06
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Date: Tue, 10 Aug 2021 05:48:17 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/6lo/JDQP0Xe2N37g6o4KkO93vzJyKsM>
Subject: Re: [6lo] Intdir telechat review of draft-ietf-6lo-plc-06
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Thank you Dave for your detailed review.

Notably based on your review, I just balloted a DISCUSS (to address your points), this DISCUSS should be relatively easy to address.

Regards

-éric

-----Original Message-----
From: Dave Thaler via Datatracker <noreply@ietf.org>
Reply-To: Dave Thaler <dthaler@microsoft.com>
Date: Saturday, 7 August 2021 at 04:03
To: "int-dir@ietf.org" <int-dir@ietf.org>
Cc: "6lo@ietf.org" <6lo@ietf.org>rg>, "draft-ietf-6lo-plc.all@ietf.org" <draft-ietf-6lo-plc.all@ietf.org>rg>, "last-call@ietf.org" <last-call@ietf.org>
Subject: Intdir telechat review of draft-ietf-6lo-plc-06
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Resent-To: <carlesgo@entel.upc.edu>du>, <itc@sgepri.sgcc.com.cn>cn>, Eric Vyncke <evyncke@cisco.com>om>, <shwetha.bhandari@gmail.com>om>, <remy.liubing@huawei.com>om>, <houjianqiang@huawei.com>om>, <charliep@computer.org>rg>, <ek.ietf@gmail.com>om>, <YGHONG@ETRI.RE.KR>
Resent-Date: Saturday, 7 August 2021 at 04:03

    Reviewer: Dave Thaler
    Review result: Almost Ready

    I am an assigned INT directorate reviewer for draft-ietf-6lo-plc-06.txt. These
    comments were written primarily for the benefit of the Internet Area Directors.
    Document editors and shepherd(s) should treat these comments just like they
    would treat comments from any other IETF contributors and resolve them along
    with any other Last Call comments that have been received. For more details on
    the INT Directorate, see https://datatracker.ietf.org/group/intdir/about/
    <https://datatracker.ietf.org/group/intdir/about/>.

    Overall I found the document to be fairly well written and understandable. 
    There were a couple of areas though where I think additional elaboration is
    needed.

    Technical comments:

    1) Page 8 talks about "the" IPv6 address used for communication with the public
    network, implying there can only be one at a time.  This is not normal in IPv6,
    where you can have a public address, the current temporary address, and the
    previous temporary address (to allow for transition to a new one), all at the
    same time.   Should this be changed to be plural?  If not, how do you support
    privacy addresses in IPv6?  What about cases where you have external
    connectivity to two public networks each with its own prefix?  I don't see this
    answered anywhere in the doc.

    2) Page 8 also mentions that a shared secret "or" version number can be used in
    a hash to derive an IID, but never defines any hash details.  To me, that
    implies that this document currently does not provide any guarantee of
    interoperability, in which case why do you need an IETF RFC at all if every
    device has to come from the same vendor with an algorithm not specified in the
    standard?   I expected this document to specify the details of a hash algorithm
    that must be implemented.

    3) RFC 8065 explains that privacy of IPv6 link-local addresses is typically
    uninteresting because on broadcast media all devices can see all the link-layer
    addresses and mappings anyway.   At least in the star and tree topologies, I
    suspect this is not the case.   However the document doesn't seem to contain
    any discussion of the privacy considerations in such a case.

    4) RFC 8065 section 4 provides a checklist of what adaptation layer
    documents like this need to address. I'd recommend addressing each point
    separately in the Security Considerations section, so it's clear that the
    draft addresses the whole checklist.  For example, there's nothing in the
    document that mentions what the typical link lifetime is (years maybe?)
    As another example, it's really hard to tell from reading the last
    paragraph of section 4.5 of this draft how it addresses RFC
    8065's statement that "any specification using Short
    Addresses should carefully construct an IID generation
    mechanism so as to provide sufficient entropy compared to
    the link lifetime" so elaboration here is warranted here in
    my opinion.

    I also have some editorial nits that can be found in a marked up copy at
    https://www.microsoft.com/en-us/research/uploads/prod/2021/08/draft-ietf-6lo-plc-06.pdf

    Dave