[Gen-art] Gen-Art LC Review: draft-ietf-ipv6-ra-flags-option-01.txt

I have been selected as the General Area Review Team (Gen-ART)
reviewer for this draft
     IPv6 Router Advertisement Flags Option
(for background on Gen-ART, please 
seehttp://www.alvestrand.no/ietf/gen/art/gen-art-FAQ.html).

Please resolve these comments along with any other Last Call comments
you may receive.

Document: draft-ietf-ipv6-ra-flags-option-01.txt
Reviewer: Joel M. Halpern
Review Date:  19-August-2007
IETF LC End Date: 2007-08-31
IESG Telechat date: (if known) 2007-09-06

Summary:
This document is ready for publication as a proposed standard.
I would change the length handling text a bit if I were writing it, 
so I have included that suggestion as part of my comments.
There is a good chance that in this particular case all of my 
comments below are too picky, but they are provided for the 
information of the general area chair.

Comments:
As a general observation, it is usually a bad idea for chairs to be 
authors of documents in their working group.  If we really don't have 
enough active participants in the IPv6 working group to get someone 
else to write this, we have a much larger problem.

The document says that the length of the option is 1.  This is in 
multiples of 8 octets, so there is lots of room.
However, the text explicitly says that the length should be checked 
in case of future expansion.  But it does not specify what to do if 
the length is not 1.
I would recommend that the text explicitly allow for lengths greater 
than 1, and simply indicate that bits past those understood by the 
receiver are too be ignored.  There could probably also be a sentence 
indicating that since bits are to be defined in order, this allows a 
receiver to properly recognize the bits it understands.

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