[6tisch] Question on draft-ietf-6lo-routing-dispatch-00

[Tengfei Chang <[e-mail]>]

Dear Pascal,

Recently Jonathan and I are working on the implementation of new 6loRH
draft: draft-ietf-6lo-routing-dispatch-00. There are something in the draft
we are not that clear yet and we would like to ask. Following are the
question:

1. in section 4.2, second paragraph:
*One or more 6LoRHs MAY be placed in a 6LoWPAN packet and MUST always*
*be placed before the LOWPAN_IPHC [RFC6282].*

What's the situation when Ip-in-Ip encapsulation structure was used?

2. section 8: IP-in-IP 6LoRH first paragraph:
*The IP-in-IP 6LoRH (IPinIP-6LoRH) is an Elective 6LoWPAN Routing*
*Header that provides a compressed form for the encapsulating IPv6*
*Header in the case of an IP-in-IP encapsulation.*

According to the description, it the IPinIP-6LoRH is a combination of
IPHC+RH3 but in a compressed format?

For example: following is the format of packet containing routing header
which defined in old draft using an Ip-in-Ip encapsulation:
MACheader + IPHC + RH3 + IPv6ExT + IPHC + ICMPv6

If we are using the 6LoRH, will it turns to :
MACheader + Paging Dispatch(page 1) + IPinIP-6LoRH + IPv6ExT + IPHC + ICMPv6

Is this correct? If not, what it should be? Thanks!

Jonathan, please corret me if there are something I didn't say clear .
Thank you!

Regard,
Jonathan, Tengfei