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Re: [Roll] 6LoRH type in useofRPLinfo

Ines Robles <mariainesrobles@googlemail.com> Thu, 04 July 2019 13:17 UTC

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From: Ines Robles <mariainesrobles@googlemail.com>
Date: Thu, 04 Jul 2019 16:17:30 +0300
Message-ID: <CAP+sJUdkzT31mJinzmNhN9=BY=X1+9-t6oKWfnYjYqX-85sWXA@mail.gmail.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
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Subject: Re: [Roll] 6LoRH type in useofRPLinfo
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Dear all,

Version 31 adds more clarification on this item.

Thank you very much Pascal for improving the document.

Best regards,

Ines.

On Tue, Jul 2, 2019 at 5:07 PM Pascal Thubert (pthubert) <pthubert@cisco.com>
wrote:

> Dear all
>
>
>
> Reviewing again
> https://tools.ietf.org/html/draft-ietf-roll-useofrplinfo-25 I think we
> made a mistake in Fig 3:
>
>
>
> The format of RFC 8138 compressed packet is presented as:
>
>
>
>    +--+-----+---+--------------+-----------+-----------+-----------+
>
>    |1 | 0|0 |TSE| 6LoRH Type 6 | Hop Limit | RPI-6LoRH |LOWPAN IPHC|
>
>    +--+-----+---+--------------+-----------+-----------+-----------+
>
>
>
> But it should really be as fig 20 in RFC 8138, meaning the RPI is before
> the IP-in-IP:
>
>
>
>
>
> +-+ ... -+-+ ... +-+- ... -+-+- ... +-+-+-+ ... +-+-+ ... -+ ... +-...
>
>  |11110001|SRH-6LoRH| RPI-  | IP-in-IP | NH=1      |11110CPP| UDP | UDP
>
>  |Page 1  |Type1 S=2| 6LoRH |  6LoRH   |LOWPAN_IPHC| UDP    | hdr |Payld
>
>  +-+ ... -+-+ ... +-+- ... -+-+-- ... -+-+-+ ... +-+-+ ... -+ ... +-...
>
>             <-8bytes->                  <-        RFC 6282 <https://tools.ietf.org/html/rfc6282>      ->
>
>                                                 No RPL artifact
>
>
>
>                Figure 20: Example Compressed Packet with SRH
>
>
>
> Data is removed from the left as consumed. Removing the IP-in-IP removes
> everything left of it including RPI.
>
> What gets forwarded to the unaware leaf starts at the LOWPAN_IPHC.
>
> What’s worth noting is that in Storing Mode the SRH contains the address
> of the 6LR that decapsulates.
>
> IOW the SRH encodes the destination of IP-in-IP, whereas the root is the
> source so the encapsulator in the IP-in-IP 6LoRH is elided…
>
>
>
> All the best,
>
>
>
> Pascal
>
>
>
>
>
>
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>

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