Re: [Technical Errata Reported] RFC5942 (6417)

"Wes Beebee (wbeebee)" <wbeebee@cisco.com> Tue, 02 February 2021 18:10 UTC

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From: "Wes Beebee (wbeebee)" <wbeebee@cisco.com>
To: RFC Errata System <rfc-editor@rfc-editor.org>, "shemant@cisco.com" <shemant@cisco.com>, "erik.nordmark@oracle.com" <erik.nordmark@oracle.com>, "ek.ietf@gmail.com" <ek.ietf@gmail.com>, "Eric Vyncke (evyncke)" <evyncke@cisco.com>, "bob.hinden@gmail.com" <bob.hinden@gmail.com>, "otroan@employees.org" <otroan@employees.org>
CC: "mellon@fugue.com" <mellon@fugue.com>, "ipv6@ietf.org" <ipv6@ietf.org>
Subject: Re: [Technical Errata Reported] RFC5942 (6417)
Thread-Topic: [Technical Errata Reported] RFC5942 (6417)
Thread-Index: AQHW9n+QnVv+kM+iSUW69ejl+zHj4qpE3IkA
Date: Tue, 2 Feb 2021 18:10:26 +0000
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Section 4 has the text:
      "If the Default Router List is empty and there
       is no other source of on-link information about any address or
       prefix:"

So - the bullet 4b only applies if the Default Router List is empty AND you don't have on-link information about the address/prefix.
Otherwise, bullet 4b does not apply.

Therefore, I think the errata is not necessary as the text of RFC 5942 as-is already has the behavior that Ted Lemon desires.

- Wes

´╗┐On 1/29/21, 3:44 PM, "RFC Errata System" <rfc-editor@rfc-editor.org> wrote:

    The following errata report has been submitted for RFC5942,
    "IPv6 Subnet Model: The Relationship between Links and Subnet Prefixes".

    --------------------------------------
    You may review the report below and at:
    https://www.rfc-editor.org/errata/eid6417

    --------------------------------------
    Type: Technical
    Reported by: Ted Lemon <mellon@fugue.com>

    Section: 4

    Original Text
    -------------
    In bullet item 4, the behavior for hosts when the default router list is empty is specified in a way that means that no prefix can ever be considered on-link.  4.b says that address resolution (which I take to mean neighbor discovery) should not be performed for any non-link-local address.

    It is entirely possible for an on-link, non-default router to advertise an on-link prefix. In this case, the prefix should be considered on-link, and address resolution should be permitted. I don't see a way to read the text to allow this.

    Corrected Text
    --------------
    I think the confusion is in 4.b, which should read:

    The host MUST NOT perform address resolution for non-link-local addresses that are not known to be on-link as described in section 3, part 1.

    Notes
    -----
    I don't know if the problem is that "non-link-local" should have been "non-on-link" or if the authors just weren't taking RFC4191 into consideration, but in the presence of RFC4191, requiring a default router before a prefix can be considered on-link renders perfectly valid configurations non-functional.

    Instructions:
    -------------
    This erratum is currently posted as "Reported". If necessary, please
    use "Reply All" to discuss whether it should be verified or
    rejected. When a decision is reached, the verifying party  
    can log in to change the status and edit the report, if necessary. 

    --------------------------------------
    RFC5942 (draft-ietf-6man-ipv6-subnet-model-12)
    --------------------------------------
    Title               : IPv6 Subnet Model: The Relationship between Links and Subnet Prefixes
    Publication Date    : July 2010
    Author(s)           : H. Singh, W. Beebee, E. Nordmark
    Category            : PROPOSED STANDARD
    Source              : IPv6 Maintenance
    Area                : Internet
    Stream              : IETF
    Verifying Party     : IESG