(Sending from my gmail account, as lists.ietf.org seems to have some
issues:)
Lowpanners,
we have had some recent discussion on issues related to network
structure, in particular the use of multicast and the issue of
sleeping nodes. I don't want to interrupt this discussion, but I
would like to remind everyone that we also have one short term
objective: Getting rechartered.
The *theme of the week* for the working group is the finalization of the
charter. In particular, the following questions have been raised:
A) is the timeline, which was too tight, now too relaxed? (Obviously,
the chairs don't think so, but what do you think?)
B) should there be work on a "minimal 6lowpan/IPv6 profile"? (I had
envisioned each of the use cases to explain what protocols are used
in implementing that particular use case, not the generation of a
unified minimal profile that would apply to all use cases.)
C) Daniel has reminded us that there needs to be a management solution
at some point. I'm not sure that simply defining a MIB is the
right way to provide this (SNMPv3 on sensor nodes?). Instead, we
could add "management method" to the subjects of the architecture
document before actually creating the solution. Is that the right
place?
D) The discussions about multicast have reminded us that 4944 alone
does not provide a solution beyond a single radio range. MANET's
SMF provides one, but presupposes some support from the routing
protocol. The BbR approach reminds me of 802.11, where all
multicast is unicast to the AP which then sends it back into the
wireless network (which might allow a simplified flooding based on
something like RPF).
E) There were some comments during the meeting that we already were
taking on a sizable amount of work. I'm not sure we want to take
on all of the other points Daniel raised:
[...] I guess we should consider how to improve the quality of RFC
4944, especially Global Address HC, TCP operation, ICMPv6 operation
and etc. RFC 4944-bis is one of options.
[...] how to dig out *mobility issue* from the proposed charter. I
guess some of requirements of mobility for 6lowpan networks is
doable for the initial activity at this stage except specific
mobility solutions.
F) Going through each of the documents, the following contributions
have been promised recently:
1 "6LoWPAN Bootstrapping and 6LoWPAN IPv6 ND Optimizations": We have
longstanding contributions from Samita Chakrabarti and Erik Nordmark.
Anybody else? Daniel has also proposed to split 1 into bootstrapping
and ND optimization. There is also the subject of commissioning.
What is the right set of documents, and which ones do (each of) you
want to work on?
2 "Problem Statement for Stateful Header Compression in 6LoWPANs":
During the meeting, Kris Pister indicated that he was interested in
contributing, and Carsten Bormann (that would be me) might be
contributing a bit of ROHC background.
3 "6LoWPAN Architecture" already has a draft from Dave Culler, Geoff
Mulligan, and JP Vasseur. Any other takers? In particular, somebody
with a network management slant?
3a "Routing requirements" (which needs its own milestone entry) has a
draft from Dominik Kaspar, Eunsook Kim, and Carsten Bormann. During
the RL2N BOF, a similar document was proposed as a result of the
RL2N-followup WG to be formed. We need to understand whether the two
documents (the 6lowpan one and the rl2n++ one) are sufficiently
different or whether we simply need to cooperate on one document,
which would then have to include the 6lowpan-specific aspects
including mesh-under.
4 "Use Cases for 6LoWPAN". Zach Shelby has indicated his interest.
Eunsook Kim et al.'s "Design and Application Spaces for 6LoWPANs"
might provide a basis, but we need more input, in particular from
implementors of each of these scenarios that we actually want to use
as use cases.
5 "6LoWPAN Security Analysis". Nobody? (I might provide some input,
but can't do this on my own.)
6 Implementers' guide: Zach Shelby is interested
7 Interop guide: Zach Shelby is interested
In order to accelerate rechartering, we should have answers to these
questions/credibles sets of contributors to these documents at the end
of this week, so please don't hesitate providing your input.
Gruesse, Carsten
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