Carsten,
On Jun 9, 2010, at 2:51 PM, Carsten Bormann wrote:
do we know how to compress this IP-RH4-IP-UDP stack?
(The first IP header compresses reasonable well; I'm worrying about
the second.)
Or did RPL just become a lot less useful in a LoWPAN with hosts?
Section 4.2 of the 6lowpan-hc-07 draft does define a LOWPAN_NHC
encoding for IPv6 headers as well as the IPv6 Extension headers
defined in RFC 2460. This should allow 6lowpan-hc to compress both
outer and inner IPv6 headers of an IP-in-IP datagram. I think that in
many cases, 6lowpan-hc makes IP-in-IP possible with very little
overhead. The outer IP header is compressed to just a few bytes
(prefixes are elided using contexts, at least one IID is elided due to
strict source route). The inner IP header is compressed as if there
were no outer IP header (prefixes are elided using contexts, IID of
source and destination can only be elided on the first and last hops,
respectively).
If you don't think the mechanism in 6lowpan-hc is effective in
compressing IP-in-IP datagrams, then we should discuss that on the
6lowpan ML.
--
Jonathan Hui
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