Hi Carsten,

It's an interesting idea! It would also save flash space by not having
special compression for each different header etc.

I'm not sure for ICMPv6/ND if it's ideal though. Compressing the messages
with a "special purpose" HC would yield considerably smaller message sizes
than generic compression schemes. 

And I think the compression can be made sufficiently simple to avoid huge
code requirements. I'll try to get my own half-baked draft out soon enough
that you can get an idea though!

  -Colin


-----Original Message-----
From: Carsten Bormann [mailto:[email protected]] 
Sent: July 12, 2010 4:49 PM
To: Colin O'Flynn
Cc: [email protected]; '6lowpan'
Subject: Re: [6lowpan] Size of NS+ARO+SLLAO in nd-10

On Jul 12, 2010, at 12:32, Colin O'Flynn wrote:

> Maybe I'll try to whip something up quickly and submit it, just so
everyone
> can understand the options I was thinking about.

Then don't look at this half-baked draft:

http://www.tzi.org/~cabo/draft-bormann-6lowpan-ghc-00pre.txt

The actual spec in there is a single page (but doesn't define how it is
integrated with hc-07 NHC yet; that will be another paragraph and might use
up the reserved code).  It will probably need another page of "Here's a nice
way to use it" for general ICMP, ND, DHCP and RPL, each.

I'm not at all sure we want to do this, that's why I never submitted it.
(It also helps if you know what RFC3320 is.  But that would be way too
complicated here.)

Gruesse, Carsten


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