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

Brian E Carpenter <brian.e.carpenter@gmail.com> Sat, 25 February 2017 19:15 UTC

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Subject: Re: Objection to draft-ietf-6man-rfc4291bis-07.txt
To: Alexandre Petrescu <alexandre.petrescu@gmail.com>, ipv6@ietf.org
References: <20170223134026.GI5069@gir.theapt.org> <9277BC0B-04F3-4FC1-901E-F83A8F0E02D7@google.com> <58AF6429.70809@foobar.org> <902276E9-0521-4D4E-A42B-C45E64763896@google.com> <58AF726A.3040302@foobar.org> <F7C230DE-4759-4B78-ABF2-6799F85B3C62@google.com> <58B014F6.2040400@foobar.org> <6DA95097-8730-4353-A0C9-3EB4719EA891@google.com> <CAN-Dau0s04c=RV0Y8AGaxBPFui41TWPTB+5o0K2Lj-iah0An1w@mail.gmail.com> <CAL9jLaYirty22iGiEjEaYq3_KA1FZhxBTOBWuFOXQ9C-WPd5xQ@mail.gmail.com> <CAN-Dau0n6oFm538XdJOcuO1yg92BCDD3mBu5YfBVm_+g-gtcKA@mail.gmail.com> <CAL9jLaYO=uYgVfSZ0SoSe0SujJ1xgwEKE8WLzo_keJHywgXTtg@mail.gmail.com> <CAN-Dau1vJV5O_Ythp6THkAu4-YZXV82Upny1V+ybbjCVZQQX=A@mail.gmail.com> <27cce319-18ac-5c0e-3497-af92344f0062@gmail.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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Date: Sun, 26 Feb 2017 08:15:25 +1300
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On 25/02/2017 23:02, Alexandre Petrescu wrote:
...
> I would agree if I read "/64 was RECOMMENDED in the past".

That would be a lie, since until now it was 'required' in the text.
 
> I would not agree if I read "/64 is NOT RECOMMENDED".

But nobody is suggesting that (in RFC 2119 it is equal to SHOULD NOT).

> I would not agree if I read "/64 is RECOMMENDED".

There I think you are wrong. It is the value that today allows portable
interoperable host software (on IEEE 802.1 or 802.11 media) so it is, in
fact, the only plausible default that we can suggest. 'Recommended' leaves
plenty of space that 'required' does not.

    Brian