Virtual reassembly buffers in 6LoWPAN
draft-ietf-lwig-6lowpan-virtual-reassembly-00

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Last updated 2018-07-02
Replaces draft-bormann-lwig-6lowpan-virtual-reassembly
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Network Working Group                                         C. Bormann
Internet-Draft                                   Universitaet Bremen TZI
Intended status: Informational                               T. Watteyne
Expires: January 3, 2019                                  Analog Devices
                                                           July 02, 2018

                 Virtual reassembly buffers in 6LoWPAN
             draft-ietf-lwig-6lowpan-virtual-reassembly-00

Abstract

   When employing adaptation layer fragmentation in 6LoWPAN, it may be
   beneficial for a forwarder not to have to reassemble each packet in
   its entirety before forwarding it.

   This has been always possible with the original fragmentation design
   of RFC 4944.  Apart from a brief mention of the way to do this in
   Section 2.5.2 of the 6LoWPAN book, this has not been extensively
   described in the literature.  The present document attempts to fill
   that gap.

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   This Internet-Draft will expire on January 3, 2019.

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   carefully, as they describe your rights and restrictions with respect
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Reassembly buffers  . . . . . . . . . . . . . . . . . . . . .   3
   3.  Virtual reassembly  . . . . . . . . . . . . . . . . . . . . .   3
   4.  Header compression  . . . . . . . . . . . . . . . . . . . . .   4
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   6.  Security considerations . . . . . . . . . . . . . . . . . . .   4
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   5
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   6LoWPAN [RFC4944] is the seminal standard for the transmission of
   IPv6 packets over IEEE 802.15.4 networks and has served as a
   blueprint for a number of related standards addressing low-power
   radios and other IoT connectivity solutions (the "6Lo suite").

   One of the problems that need to be solved to enable sending IPv6
   packets over low-power radios is that some of these (including IEEE
   802.15.4) do not support frames that are large enough to hold IPv6
   packets of the minimum MTU (Maximum Transmission Unit) defined for
   IPv6, 1280 bytes.  This necessitates providing a fragmentation or
   segmentation scheme in the IP adaptation layer for the radio.

   When employing adaptation layer fragmentation on constrained-node
   networks [RFC7228], it may be beneficial for a forwarder not to have
   to reassemble each packet in its entirety before forwarding it.

   This has been always possible with the original fragmentation design
   of RFC 4944.  Apart from a brief mention of the way to do this in
   Section 2.5.2 of the 6LoWPAN book [BOOK], this has not been
   extensively described in the literature.  The present document
   attempts to fill that gap.

   [I-D.watteyne-6lo-minimal-fragment] provides additional context and
   discussion about handling fragment forwarding in the 6Lo standards
   suite.

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2.  Reassembly buffers

   An adaptation layer implementation for 6LoWPAN needs to perform
   reassembly of every fragmented packet received in order to be able to
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