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Re: 6man w.g. last call for <draft-ietf-6man-default-iids-11.txt>

Lorenzo Colitti <lorenzo@google.com> Fri, 20 May 2016 07:30 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Fri, 20 May 2016 16:20:44 +0900
Message-ID: <CAKD1Yr3uz2ddGArKGh2GGf=pBadx-C-0RG2VhsStSsrPfeqdOQ@mail.gmail.com>
Subject: Re: 6man w.g. last call for <draft-ietf-6man-default-iids-11.txt>
To: Ole Troan <otroan@employees.org>
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On Fri, May 20, 2016 at 4:04 PM, <otroan@employees.org> wrote:

> > Excellent! Now, if we can only make this draft stop saying that that you
> SHOULD NOT do that...  :-)
>
> Everything has to be read in context. My reading of this document is that
> it says what an implementation SHOULD do _iff_ a stable IID is to be
> generated. It says nothing about what to do if a stable IID is not required.
>

On Ethernet, it is always required. The reason is this text:

   The recommendations in this document apply only in cases where
   implementations otherwise would have configured a stable IPv6 IID
   containing a link layer address.

Currently, implementations must configure a EUI-64 IID, per RFC 2464
section 4. Thus, by definition any currently-compliant implementation of
RFC 2464 "configures a stable IPv6 IID", all the time. If this document
becomes an RFC, a compliant implementation will thus have to follow the
recommendations of this document all the time.

If we want to clarify this, then I propose this text:

   The recommendations in this document apply only in cases where
   implementations otherwise would have configured a stable IPv6 IID
   containing a link layer address. Configuring a stable IPv6 IID is
   OPTIONAL.

Cheers,
Lorenzo

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