Hi,

On Thu, Aug 09, 2018 at 11:02:45PM +0800, Jian-Hong Pan wrote:
...

For LoRaWAN, it is a star topology.

In sense of 6LoWPAN that means "border router" in the middle which runs
radvd on it and sending RA messages. Then doing a route (or even allow nd
proxy) between capable $IPv6 (ethernet?) and LoRa 6LoWPAN interface.

All others listen for RA messages with PIO and doing autoconfiguration.
(In 6LoWPAN you would also pass a 6CO option to compress the PIO
prefix, which would make sense to fully elide all IP addresses in the
header).

- Alex