Hi,
Thanks for all the pointers. I'll need some time think and come back to
this much later. After hanging out with Pascal today in Sophia we
actually have a solution for this - after HC and ND are through first.
Julien Abeille (jabeille) wrote:
Hi all,
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of
Alexandru Petrescu
Sent: mardi 26 mai 2009 13:05
To: Zach Shelby
Cc: 6lowpan
Subject: Re: [6lowpan] MIPv6 and 6LoWPAN
Hi Zach,
Right, a good conceptual place to put a Mobile IPv6-based NEMO Mobile Router is
the Edge Router. However, the Edge Router (Border Router?) isn't supposed to
move.
There are other concepts in the NEMO-MANET interaction space that could be
interesting for LoWPAN ER. For example, if each ER informed the other ER about
the prefix it holds on its sensor link, then the other ERs could reach these
sensors. This was proposed for example for egress-egress interactions of
Mobile Routers, using ICMP RA. It could probably be OSPF instead.
Also, probably, it could make sense to have one sensor-node MR to move from
under one ER (move together with some of its smaller sensornode
LFNs) to another ER, and consider the old ER to be its Home Agent, and execute
Mobile IPv6-based NEMO protocol extensions. In this sense, the ER wouldn't be
an IPv6-based FA, but a HA.
About PMIPv6: obviously PMIPv6 would apply in a sense, but first is ER supposed
to be the PMIPv6 MAG or the PMIPv6 LMA?
[Julien] In my opinion ER would be a MAG. As Pascal mentionned, this works
pretty well in a mesh under scenario, not route over. I would think MIPv6
applies in the route over case. I do not see yet what NEMO would bring.
Agreed. After looking into the dirty details of PMIPv6 - it is really
not suitable for 6lowpan as is, espcially for route over.
(PMIPv6 design works in a way as NEMO does, in that PMIPv6 MAG updates a prefix
on PMIPv6 LMA, just as NEMO MR updates a prefix on NEMO HA).
[Julien] I agree, but in NEMO by default the MR moves, and the nodes on the
ingress interface don't. In PMIPv6 the MAG does not move, and the nodes on the
ingress do.
Exactly - they are for two different purposes clearly. Edge routers
definitely can move, and whole LoWPANs of course, look at body sensor
networks for example. Here NEMO is perfect.
Pascal pointed out the work on Proxy Home Agents and GlobalHaHa, which
may really make MIPv6 suitable for LoWPAN nodes. This is something to
consider in the future at least - seems to have the best potential for
node mobility.
Anyways - we're not chartered for this now - but wink, wink - when
rechartering some day this is an interesting topic.
Best,
Julien
Alex
Zach Shelby a écrit :
Hi,
On a bit of a tangent... I have been studying different ways of
dealing with mobility of 6LoWPAN nodes and networks. Extended LoWPANs
provide some mobility support for micro-mobility, which is good.
Properly designed applications can also deal with IP addresses
changing. But what if you would want to have a stable IP address for a
6LoWPAN node or a stable prefix for a whole LoWPAN?
MIPv6 have several problems to be used directly by LoWPAN nodes,
e.g.: - IP-in-IP encapsulation with the home agent - Security for
binding management messages - Potentially large amounts of binding
messages Is anyone aware of work on MIPv6 proxy mechanisms which would
allow e.g. an Edge Router to proxy MIPv6 operations on behalf of a
LoWPAN node? Maybe revive the Foreign Agent for IPv6? ;-)
NEMO is much more clearly applicable to 6LoWPAN network mobility. The
basic NEMO protocol is a perfect match, allowing an Edge Router or
other router in the visited network to act as a Mobile Router and
perform MIPv6 on behalf of the network. Thus maintaining constant
prefixes for all LoWPANs under the router. I don't see route
optimization to be necessary for NEMO used with 6LoWPAN, the
performance of traffic going through the home agent should be fine.
Thoughts?
- Zach
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