Zach and Pascal,
The outer header can be compressed using the context based compression
scheme in 6lowpan-hc-07.
However, I think it is safer if the header of the tunnelled (inner)
packet is uncompressed, rather than using 6LowPAN compression on it.
This avoids potential problems with compression extending beyond the
first fragment.
For the same reason, I also think that carrying the routing header's
type and length in line is safer, rather than using the extension header
compression in 4.2 of 6lowpan-hc-07.
Pascal's proposed inner header compression is independent of
6lowpan-hc-07 and could be added to the rpl-routing-header draft.
Rather than compressing only if the inner / outer source / dest fully
match, a scheme similar to that of the addresses within the routing
header could be used. A field similar to the Compr field could be used
to match octets of the inner header src/dest against the outer header.
This would provide good compression inside the LowPAN where all
addresses bear the same /64 or /112 prefix.
Daniel.
Pascal Thubert (pthubert) wrote:
Hi Zach:
You're right.
It would make sense to make the slight update to compress when the inner
and outer source or destination are identical.
I do not think that this would cause any trouble with the last call that
passed already, would it?
What about making that change and pushing to IESG?
Pascal
-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of Zach Shelby
Sent: Tuesday, July 06, 2010 1:49 PM
To: 6lowpan
Subject: [6lowpan] IPv6-in-IPv6 tunneling (RFC2473)
Both of the new 6man drafts needed by RPL are requiring the use of
RFC2473
IPv6-in-IPv6 tunneling. I like IPv6 tunneling and all, but has anyone
thought
out how this is going to work over a 6LoWPAN with HC?
Zach
--
Zach Shelby, Chief Nerd, Sensinode Ltd.
http://zachshelby.org - My blog "On the Internet of Things"
http://6lowpan.net - My book "6LoWPAN: The Wireless Embedded Internet"
Mobile: +358 40 7796297
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__________________________________________________
Daniel Gavelle, Software Engineer
Tel: +44 114 281 2655
Fax: +44 114 281 2951
Jennic Ltd, Furnival Street, Sheffield, S1 4QT, UK
Comp Reg No: 3191371 Registered In England
http://www.jennic.com
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