[6lo] Fwd: [Technical Errata Reported] RFC4944 (4359)

[Brian Haberman <[e-mail]>]

All,
     I would like feedback on this erratum.  It appears to be correct,
in my view.  Any objections to me marking it Verified?

Regards,
Brian


-------- Forwarded Message --------
Subject: [Technical Errata Reported] RFC4944 (4359)
Date: Thu,  7 May 2015 12:07:39 -0700 (PDT)
From: RFC Errata System <[e-mail]>
To: [e-mail],
[e-mail], [e-mail],
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CC: [e-mail], [e-mail],
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The following errata report has been submitted for RFC4944,
"Transmission of IPv6 Packets over IEEE 802.15.4 Networks".

--------------------------------------
You may review the report below and at:
http://www.rfc-editor.org/errata_search.php?rfc=4944&eid=4359

--------------------------------------
Type: Technical
Reported by: Gabriel Montenegro <[e-mail]>

Section: 5.1

Original Text
-------------
   ESC:  Specifies that the following header is a single 8-bit field for
      the Dispatch value.  It allows support for Dispatch values larger
      than 127.

Corrected Text
--------------
   ESC:  Specifies that the following header is a single 8-bit field for
      the Dispatch value.  It allows support for Dispatch values larger
      than 63.

Notes
-----
The (non-ESCaped) Dispatch value is a 6-bit selector. However, it used
to be a 7-bit selector, which has a value at most 127. When the field
became a 6-bit selector, this maximum became 63, but the referring text
was never updated.

For historical reference, see an early version from IETF 67 proposing
the Dispatch value within the Dispatch header as a 7-bit field:

http://6lowpan.tzi.org/FrontPage?action=AttachFile&do=view&target=tentative-draft2-ietf-6lowpan-format-07.txt

   The dispatch type is defined by a zero-bit as the first bit.  The
   dispatch type and header is shown here:

                        1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |0|  Dispatch   |  type-specific header
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   Dispatch               7-bit selector.  Identifies the type of header
                          immediately following the Dispatch type.

The relevant slides also show this (slide 8):
http://6lowpan.tzi.org/FrontPage?action=AttachFile&do=view&target=6lowpan-header-proposal-2.ppt

Instructions:
-------------
This erratum is currently posted as "Reported". If necessary, please
use "Reply All" to discuss whether it should be verified or
rejected. When a decision is reached, the verifying party (IESG)
can log in to change the status and edit the report, if necessary.

--------------------------------------
RFC4944 (draft-ietf-6lowpan-format-13)
--------------------------------------
Title               : Transmission of IPv6 Packets over IEEE 802.15.4
Networks
Publication Date    : September 2007
Author(s)           : G. Montenegro, N. Kushalnagar, J. Hui, D. Culler
Category            : PROPOSED STANDARD
Source              : IPv6 over Low power WPAN
Area                : Internet
Stream              : IETF
Verifying Party     : IESG



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