Re: [6lo] I-D Action: draft-ietf-6lo-rfc6775-update-07.txt

Thanks Pascal for the revised text.

Have some more points...

The revised text suggests to use EARO in the DAR/DAC messages (section 
6.1 in 6775-update-07) to include TID so as to indicate freshness.

Current RFC6775 does not use ARO option in DAR/DAC message (section 
4.1), but it copies most (but not all) of its fields including 
registration lifetime, EUI-64 in the Duplicate Address Messages.
Quoting RFC6775, "The information contained in the ARO is also included in 
the multihop DAR and DAC messages used between 6LRs and 6LBRs, but the 
option itself is not used in those messages."

Two points:
a. This update suggests including EARO in DAR/DAC message which is in 
contradiction to the text suggested in section4.1-RFC6775. Per me, I don't 
see a problem with this inclusion, but just want to highlight this fact 
and wondering if a text update could be added.
b. Secondly, with this inclusion, the reg lifetime and EUI-64 is redundant 
in the DAR/DAC (since EARO option and base DAR/DAC have the same fields). 
This is 12bytes redundancy! Essentially what we want is TID to be 
included in DAR/DAC messages but using EARO in DAR/DAC might not be the 
best way to do it.

Regards,
Rahul

On Fri, 28 Jul 2017, Pascal Thubert (pthubert) wrote:

> Dear chairs and all:
>
> This revision addresses Sedat and Rahul's WGLC comments, and integrates the computation of the TID as discussed at the WG meeting.
>
> To my best knowledge, the document is ready for the next steps.
>
> Take care,
>
> Pascal
>
> -----Original Message-----
> From: 6lo [mailto:6lo-bounces@ietf.org] On Behalf Of internet-drafts@ietf.org
> Sent: vendredi 28 juillet 2017 20:45
> To: i-d-announce@ietf.org
> Cc: 6lo@ietf.org
> Subject: [6lo] I-D Action: draft-ietf-6lo-rfc6775-update-07.txt
>
>
> A New Internet-Draft is available from the on-line Internet-Drafts directories.
> This draft is a work item of the IPv6 over Networks of Resource-constrained Nodes WG of the IETF.
>
>        Title           : An Update to 6LoWPAN ND
>        Authors         : Pascal Thubert
>                          Erik Nordmark
>                          Samita Chakrabarti
> 	Filename        : draft-ietf-6lo-rfc6775-update-07.txt
> 	Pages           : 31
> 	Date            : 2017-07-28
>
> Abstract:
>   This specification updates RFC 6775 - 6LoWPAN Neighbor Discovery, to
>   clarify the role of the protocol as a registration technique,
>   simplify the registration operation in 6LoWPAN routers, as well as to
>   provide enhancements to the registration capabilities and mobility
>   detection for different network topologies including the backbone
>   routers performing proxy Neighbor Discovery in a low power network.
>
>
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-6lo-rfc6775-update/
>
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-ietf-6lo-rfc6775-update-07
> https://datatracker.ietf.org/doc/html/draft-ietf-6lo-rfc6775-update-07
>
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=draft-ietf-6lo-rfc6775-update-07
>
>
> Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org.
>
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>
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