This specification updates RFC 6775 -- the Low-Power Wireless
Personal Area Network (6LoWPAN) Neighbor Discovery specification --
to clarify the role of the protocol as a registration technique and
simplify the registration operation in 6LoWPAN routers, as well as to
provide enhancements to the registration capabilities and mobility
detection for different network topologies, including the Routing
Registrars performing routing for host routes and/or proxy Neighbor
Discovery in a low-power network.