Before IETF78, we had a discussion about the size of certain packets such as
the 6lowpan-ND Router Advertisements. At the time, I pointed to a pre-draft
that contained a basic design for a header compression scheme addressing this
and other oversized packets in the 6lowpan operational protocols.
On Jul 12, 2010, at 17:48, I wrote:
> 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.
That spec is now complete (and still a single page for the compression, plus
another page for how it works together with the finished 6lowpan-HC).
(Actually, the spec already is a -01, simplified from -00 *and* getting
slightly better compression.)
There are also six pages of examples showing the compression of actual packets
from the 6lowpan packets repository; the compression factors are not as good as
they could be with a specially-made compression scheme for each format, but
they seem surprisingly good for a 1-page spec.
Enjoy at:
http://tools.ietf.org/html/draft-bormann-6lowpan-ghc
Before/in Beijing, we maybe can discuss whether we want to have something like
this in 6lowpan, and, if yes, which parts of the design we want to use.
(Then I'll fix the Security Considerations section and add the missing text
about fragment boundaries.)
Gruesse, Carsten
PS.: If someone can provide a pcap file for one of the RPL formats not yet
shown in the Examples section, I would be grateful. Of course, any other
real-world captures, including DHCPv6, also would help.
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