Re: [Roll] 6LoRH type in useofRPLinfo
"Pascal Thubert (pthubert)" <pthubert@cisco.com> Tue, 02 July 2019 14:14 UTC
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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: 6LoRH type in useofRPLinfo
Thread-Index: AdUw3XSCsslxmm7SSOSYMeH+zXkgcQAAjLPA
Date: Tue, 02 Jul 2019 14:14:35 +0000
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Subject: Re: [Roll] 6LoRH type in useofRPLinfo
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Dear all
Actually since there is only one entry in the SRH the drawing in fig 20 of RFC 8138 must be adapted for a size of 0 (meaning 1 entry) and a total length of 4 octets.
+-+ ... -+-+ ... +-+- ... -+-+- ... +-+-+-+ ... +-+-+ ... -+ ... +-...
|11110001|SRH-6LoRH| RPI- | IP-in-IP | NH=1 |11110CPP| UDP | UDP
|Page 1 |Type1 S=0| 6LoRH | 6LoRH |LOWPAN_IPHC| UDP | hdr |Payld
+-+ ... -+-+ ... +-+- ... -+-+-- ... -+-+-+ ... +-+-+ ... -+ ... +-...
<-4bytes-> <- RFC 6282<https://tools.ietf.org/html/rfc6282> ->
No RPL artifact
All the best,
Pascal
From: Pascal Thubert (pthubert)
Sent: mardi 2 juillet 2019 16:07
To: 'Routing Over Low power and Lossy networks' <roll@ietf.org>
Subject: 6LoRH type in useofRPLinfo
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
- [Roll] 6LoRH type in useofRPLinfo Pascal Thubert (pthubert)
- Re: [Roll] 6LoRH type in useofRPLinfo Pascal Thubert (pthubert)
- Re: [Roll] 6LoRH type in useofRPLinfo Alvaro Retana
- Re: [Roll] 6LoRH type in useofRPLinfo Ines Robles