Hi Authors,
  I went through draft-ietf-6man-rpl-option-01 and I had some comments.

* Section 2

This text is not consistent with the option type request in section 3

"and that ICMP errors return to the RPL Option source rather than ..."

The option type in section 3 (Top two bits 01) will not result in ICMPv6 errors being sent. Is this really your intent?


* Section 3

This option is missing an alignment requirement. Given that the SenderRank is a 16 bit number, I would recommend having an alignment requirement of 2n.


* Section 5

I don't think this text is consistent with the tunneling behavior specified earlier in the document. Especially this text

"RPL Border Routers MUST remove
   the RPL Option from the datagram and update the IPv6 Payload Length
   field accordingly."

does not agree with the tunneling behavior. If I understand correctly, the RPL option will be included after the outer IPv6 header that encapsulates the IPv6 datagram to be forwarded to the outside world. All the RPL border router needs to do is to process the outer IPv6 header and HBH options header and remove them before forwarding it to the outside world. Is my understanding incorrect?

Cheers
Suresh
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