Hi Richard,
On Apr 13, 2009, at 7:40 AM, Richard Kelsey wrote:
In Richard's case, I see two different Access Routers *not*
connected
over a backbone but advertise different prefixes to the same PAN.
Nodes in the PAN may be multihomed and configure addresses for the
two
different networks. If we define a whiteboard to manage addresses
for
a particular prefix, then we have two whiteboards and let's assume
that each resides at their respective advertising Access Router.
Ouch. I have been worrying about where to find the space to
store one whiteboard and now there are two. Does the
whiteboard have to be on a LoWPAN device or can it be on
some other router reachable via a backhaul network?
In the current 6LoWPAN ND model, there needs to be a whiteboard entry
for every IPv6 address assigned to an interface in the PAN. That's
true whether or not the information is spread across one or multiple
white boards. If you're worried about code space, then yes, of course,
that part is duplicated. But if you want the network to function with
Access Router A or Access Router B or both and the whiteboard is
located at an Access Router, then both have to implement it any way.
The 6LoWPAN ND model does support a Relay option. There's a question
of whether or not there can be multiple Relay hops. If we did that,
then this would start to look awfully close to DHCPv6.
--
Jonathan Hui
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