In section 4, "Router Behavior" draft-ietf-6man-rpl-option
says:
Routers MUST use IPv6-in-IPv6 tunneling, as specified in
[RFC2473] to include a new RPL Option in datagrams that
are sourced by other nodes.
What destination should be used for the tunnel header? The
router adding the RPL option may not know if the original
destination is inside or outside the RPL domain. And if the
original destination is outside the RPL domain, the router
may not know the address of the border router that will
forward the datagram outside.
Also, there are normative statements which use the term "RPL
domain", such as
Datagrams sent between nodes within a RPL domain MUST include
a RPL Option or RPL Source Route Header (SRH) and MAY include
both.
but "RPL domain" is not defined. In particular, if a RPL
router has a non-RPL-aware host, is the host inside the RPL
domain? Or is the router then a border router and messages
to the host need to be tunnelled to it?
-Richard Kelsey
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