Hi,
Here are my comments on hc-01. Overall I think we are quite close with
the comments from Pascal and Julien.
I found the DDF name confusing. Now it has been renamed CTX in the
latest formats on the list, great.
As Pascal pointed out, nodes need to be able to decode all these
options. One thing that worries me in having 16 contexts, is that nodes
are forced to store them all. That is worst case 272 bytes of memory
consumption. Worth it? Is it possible that an ultra-simple node would
only have to understand the default context?
The default context identifier '0000' could be clarified more in the
draft. When CTX is '10' then the default context identifier '0000' is
used. It should be made clear that this is the prefix advertised in RAs
as useable for SAA.
Regarding the ND for 6lowpan draft, HC-01 means we need to add a 4-bit
context identifier flag to the 6LoWPAN Prefix Information Option. To
make things clear that should always be '0000' if the A flag is '1'?
- Zach
Jonathan Hui wrote:
http://tools.ietf.org/html/draft-ietf-6lowpan-hc
This new version reflects the recent discussions on the list. The
changes are:
- HC back to 1 byte by default by stealing a few bits from the dispatch
field.
- Added better support for multicast address compression.
- Fixed alignment for UDP port compression.
- Better support for Traffic Class and Flow Label compression.
- Pascal joined as an author.
Happy reading!
--
Jonathan Hui
Begin forwarded message:
From: IETF I-D Submission Tool <[EMAIL PROTECTED]>
Date: October 8, 2008 7:15:35 PM PDT
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Subject: New Version Notification for draft-ietf-6lowpan-hc-01
A new version of I-D, draft-ietf-6lowpan-hc-01.txt has been
successfuly submitted by Jonathan Hui and posted to the IETF repository.
Filename: draft-ietf-6lowpan-hc
Revision: 01
Title: Compression Format for IPv6 Datagrams in 6LoWPAN Networks
Creation_date: 2008-10-09
WG ID: 6lowpan
Number_of_pages: 15
Abstract:
This document specifies an IPv6 header compression format for IPv6
packet delivery in 6LoWPAN networks. The compression format relies
on shared context to allow compression of arbitrary prefixes. This
document specifies compression of multicast addresses and a framework
for compressing next headers. This framework specifies UDP
compression and is prepared for additional transports.
The IETF Secretariat.
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--
Zach Shelby
Head of Research
Sensinode Ltd.
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