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)
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Date: Tue, 02 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
- [Technical Errata Reported] RFC5942 (6417) RFC Errata System
- Re: [Technical Errata Reported] RFC5942 (6417) Wes Beebee (wbeebee)