Re: [dhcwg] Last Call: <draft-ietf-dhc-anonymity-profile-06.txt> (Anonymity profile for DHCP clients) to Proposed Standard

神明達哉 <jinmei@wide.ad.jp> Tue, 23 February 2016 17:35 UTC

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Date: Tue, 23 Feb 2016 09:35:55 -0800
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Subject: Re: [dhcwg] Last Call: <draft-ietf-dhc-anonymity-profile-06.txt> (Anonymity profile for DHCP clients) to Proposed Standard
From: =?UTF-8?B?56We5piO6YGU5ZOJ?= <jinmei@wide.ad.jp>
To: Tim Chown <tjc@ecs.soton.ac.uk>
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At Tue, 23 Feb 2016 12:50:01 +0000,
Tim Chown <tjc@ecs.soton.ac.uk> wrote:

> > That's actually the contrary of what the specs say today: if M=1 you do
> > DHCPv6, not SLAAC.
> >
> > I don't see any statement in 4861 that says that. Per 4861, M=1 means "DHCPv6 is available", not "nodes should do DHCPv6". Relevant text:
> >
> >       M              1-bit "Managed address configuration" flag.  When
> >                      set, it indicates that addresses are available via
> >                      Dynamic Host Configuration Protocol [DHCPv6]
>
> I agree. It’s always just been a hint, no more, no less. And it’s been discussed many times...

+1.  I understand it may look subtle and could be confusing probably
because it was a kind of compromise as we could reach consensus on how
M/A flags should actually work.  But, however it looks, I'm pretty
sure that the intent of RFC4861 is that we do NOT say "if M=1 you do
DHCPv6", and that was intentional.  Let alone RFC4862 (for which I
happen to be a document editor): it even removed references to the M/O
flags:

   o  Removed the text regarding the M and O flags, considering the
      maturity of implementations and operational experiences.
      ManagedFlag and OtherConfigFlag were removed accordingly.  (Note
      that this change does not mean the use of these flags is
      deprecated.)

As such, I don't see the need for adding the "update: RFC 4682" mark
because of the proposed text.  (I don't have a particular opinion on
the text itself, btw).

--
JINMEI, Tatuya