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Re: [icnrg] ICNLoWPAN Document Action

Cenk Gündoğan <mail+ietf@gundogan.net> Wed, 22 September 2021 17:10 UTC

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From: Cenk Gündoğan <mail+ietf@gundogan.net>
To: icnrg@irtf.org
Cc: Colin Perkins <csp@csperkins.org>
Date: Wed, 22 Sep 2021 19:03:54 +0200
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Subject: Re: [icnrg] ICNLoWPAN Document Action
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Dear group,

just a heads-up that we will proceed with the below proposed solution to
fix the mentioned registry clashes.

Thanks,
Cenk

On Wed, Sep 15 2021 at 08:26 +0200, Cenk Gündoğan wrote:

> [[PGP Signed Part:Undecided]]
> Dear group,
>
> Table 2 of the ICNLoWPAN document [1] requests IANA updates to the
> "6LoWPAN Dispatch Type Field" registry.  The last entry of table 2
> clashes, however, with an existing registration. (11 11xxxx for "Page
> dispatch").
>
> The solution is simple: we increase the prefix for the last entry from
> "11 1xxxxx" to "11 10xxxx".  This decreases the option space for
> dispatches, but that particular dispatch (Figure 26) has a "Reserved"
> bit, which we can drop to increase it again.
>
> This:
>  0                                       1
>  0   1   2   3   4   5   6   7   8   9   0   1   2   3   4   5	 	  
> +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+	  
> | 1 | 1 | 1 |CID|EXT|VER|FLG|FRS|PAY|RCT|MGH| PLTYP |EXP|VAL|RSV|	  
> +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+	  
>   	
> Becomes:
> 0                                       1
> 0   1   2   3   4   5   6   7   8   9   0   1   2   3   4   5	        
> +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+	
> | 1 | 1 | 1 | 0 |VER|FLG|FRS|PAY|RCT|MGH| PLTYP |EXP|VAL|CID|EXT|	
> +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+	
>
> This diff [2] summarizes the necessary changes, it also moves the CID
> and EXT bits of all dispatches to the end to keep the styling
> harmonized.
>
> What does the group think about this proposed solution?  Are there any
> objections?  To let it sufficiently marinate, feedback is very welcome
> until wednesday next week :-)
>
> Cheers,
> Cenk
>
> [1] https://datatracker.ietf.org/doc/html/draft-irtf-icnrg-icnlowpan-10
> [2]
> https://tools.ietf.org//rfcdiff?url1=draft-irtf-icnrg-icnlowpan-10&url2=https://inet.haw-hamburg.de/tmp/draft-irtf-icnrg-icnlowpan-11.txt/@@download/file/draft-irtf-icnrg-icnlowpan-11.txt

--

Cenk Gündoğan

Hamburg University of Applied Sciences
Dept. of Computer Science / Internet Technologies Group
Berliner Tor 7, 20099 Hamburg, Germany
Fon: +49 40 42875 - 8426
Mail: cenk.guendogan@haw-hamburg.de
Web: https://www.inet.haw-hamburg.de/

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