At Wed, 18 Feb 2009 21:20:14 +0100,
Alexandru Petrescu <alexandru.petre...@gmail.com> wrote:

> > I'd think it simply breaks the standard, but I actually don't
> > understand the point of the question in the first place.  Maybe you
> > want to explain what you're going to do with the additional 8bit
> > space, and then ask others what they think about it.
> 
> Well, nothing, do nothing with the additional 8bit space.  Make it 0, 
> that's it.

Then I don't think you can convince others (including myself) to
change the spec.

> It doesn't use it for anything.  It is there just in order to put a 
> 56bit prefix in the RA and the other end to auto-configure an address ok.
> 
> Why should I put a /64 in the RA when that link is adminsitratively 
> assigned a /56.

If your goal is to use a /56 as an on-link prefix while using
stateless autoconfiguration, you can do it without changing the
standard by advertising:

- prefix P::/56 with L=1, A=0, and
- prefix P::/64 with L=0, A=1

if the receiving host is fully compliant with RFC4861 and 4862.

---
JINMEI, Tatuya
Internet Systems Consortium, Inc.
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