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[6lo] draft-ietf-6lo-fragment-recovery maximum fragment size too small

Michel Veillette <Michel.Veillette@trilliant.com> Tue, 08 January 2019 17:38 UTC

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From: Michel Veillette <Michel.Veillette@trilliant.com>
To: "6lo@ietf.org" <6lo@ietf.org>
Thread-Topic: draft-ietf-6lo-fragment-recovery maximum fragment size too small
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Date: Tue, 08 Jan 2019 17:38:15 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/6lo/3bx2cGjxHymR3QRVLUVRPT0Q1YM>
Subject: [6lo] draft-ietf-6lo-fragment-recovery maximum fragment size too small
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Hi authors of "draft-ietf-6lo-fragment-recovery"

I'm currently working on a fragment forwarding implementation based on "draft-ietf-6lo-fragment-recovery".
In some cases, relatively large fragments need to be supported (i.e. minimum MTU transferred using 3 fragments).
However, the current format of the RFRAG Dispatch type limits fragment size to only 128 bytes.

Is it possible to modify the RFRAG Dispatch type (https://tools.ietf.org/html/draft-ietf-6lo-fragment-recovery-00#section-5.1)
and corresponding RFRAG Acknowledgment Dispatch type (https://tools.ietf.org/html/draft-ietf-6lo-fragment-recovery-00#section-5.2)
to allow larger fragments?

For example:

                           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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |1 1 1 0 1 0 0|  fragment_size  |X|E|     datagram_tag          |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |sequence |  fragment_offset    |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                           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
                      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                      |1 1 1 0 1 0 1 Y| R |     datagram_tag          |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |          RFRAG Acknowledgment Bitmap (32 bits)                |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+



R = reserved


Regards,
Michel Veillette

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