Re: Objection to draft-ietf-6man-rfc4291bis-07.txt

David Farmer <farmer@umn.edu> Fri, 24 February 2017 19:51 UTC

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From: David Farmer <farmer@umn.edu>
Date: Fri, 24 Feb 2017 13:51:08 -0600
Message-ID: <CAN-Dau0n6oFm538XdJOcuO1yg92BCDD3mBu5YfBVm_+g-gtcKA@mail.gmail.com>
Subject: Re: Objection to draft-ietf-6man-rfc4291bis-07.txt
To: Christopher Morrow <christopher.morrow@gmail.com>
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Cc: james woodyatt <jhw@google.com>, 6man WG <ipv6@ietf.org>
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On Fri, Feb 24, 2017 at 1:36 PM, Christopher Morrow <
christopher.morrow@gmail.com>; wrote:

> sorry, a clarification request below.
>
> On Fri, Feb 24, 2017 at 1:42 PM, David Farmer <farmer@umn.edu>; wrote:
>
>>
>>
>> On Fri, Feb 24, 2017 at 12:11 PM, james woodyatt <jhw@google.com>; wrote:
>>
>>> On Feb 24, 2017, at 03:11, Nick Hilliard <nick@foobar.org>; wrote:
>>>
>>>
>>> Let me be more specific then: are you proposing that vendors write code
>>> to allow or disallow interface subnets which aren't /64 (or /127)? This
>>> is a binary choice; a vendor needs to choose one way or another.
>>>
>>>
>>> I don’t know how I can be more clear about this: I insist that general
>>> purpose host operating system developers should be expressly permitted to
>>> write code that declines to accept subnet prefixes of any length other than
>>> /64 on the grounds that these are not used in general IPv6 networking and
>>> the successor to RFC 4291 continues to say so.
>>>
>>> I know there are operating systems with billions of units in the field
>>> today that do exactly this because RFC 4291 and its predecessors have for
>>> years given them clear license to do so, and I don’t want to see the
>>> publication of I-D.ietf-6man-rfc4291bis as RFC come to remove this license
>>> as a side effect of promoting IPv6 to full Standard category.
>>>
>>> You want to remove that license? I suppose we can continue discussing
>>> that, but I think you should try to do it in a separate draft once IPv6 is
>>> officially promoted.
>>>
>>> --james woodyatt <jhw@google.com>;
>>>
>>
>> I would not want to make code that does /64 only out of compliance with
>> the spec, especially for SLAAC.  I would like to discourage that stance,
>> maybe for DHCP, but for sure for manual configuration if that mode is
>> provided.  But, I don't see /64 only as a invalid stance for an host OS to
>> take.  But neither do I want the spec to disallow non-/64 for DHCP, manual
>> configuration, or potential new modes of configuration if we ever get
>> there.  I think SLAAC should to remain /64 only. I think DHCP and manual
>> configuration should be encourage to support non-/64 options, but even they
>> should allow /64 only.
>>
>>
> please restate your last sentence... I think you missed a word or three?
>

It's still ok for a host OSes to do /64 only with DHCP and manual config,
not preferred.  I'd prefer host OSes support non-/64 as well for DHCP and
manual config, but not mandatory.  Only /64 should be REQUIRED of anyone,
host, router, or what ever.  Non-/64 should be OPTIONAL for everyone.

Is that clearer?

thanks
>>
>> --
>> ===============================================
>> David Farmer               Email:farmer@umn.edu
>> Networking & Telecommunication Services
>> Office of Information Technology
>> University of Minnesota
>> 2218 University Ave SE        Phone: 612-626-0815 <(612)%20626-0815>
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>


-- 
===============================================
David Farmer               Email:farmer@umn.edu
Networking & Telecommunication Services
Office of Information Technology
University of Minnesota
2218 University Ave SE        Phone: 612-626-0815
Minneapolis, MN 55414-3029   Cell: 612-812-9952
===============================================