DCCP Extensions for Multipath Operation with Multiple Addresses
draft-amend-tsvwg-multipath-dccp-04

Document Type Active Internet-Draft (individual)
Authors Markus Amend  , Dirk Hugo  , Anna Brunstrom  , Andreas Kassler  , Veselin Rakocevic  , Stephen Johnson 
Last updated 2021-02-22
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Transport Area Working Group                                    M. Amend
Internet-Draft                                                   D. Hugo
Intended status: Experimental                                         DT
Expires: 26 August 2021                                     A. Brunstrom
                                                              A. Kassler
                                                     Karlstad University
                                                            V. Rakocevic
                                               City University of London
                                                              S. Johnson
                                                                      BT
                                                        22 February 2021

    DCCP Extensions for Multipath Operation with Multiple Addresses
                  draft-amend-tsvwg-multipath-dccp-04

Abstract

   DCCP communication is currently restricted to a single path per
   connection, yet multiple paths often exist between peers.  The
   simultaneous use of these multiple paths for a DCCP session could
   improve resource usage within the network and, thus, improve user
   experience through higher throughput and improved resilience to
   network failures.

   This document presents a set of extensions to traditional DCCP to
   support multipath operation.  Multipath DCCP provides the ability to
   simultaneously use multiple paths between peers.  The protocol offers
   the same type of service to applications as DCCP and it provides the
   components necessary to establish and use multiple DCCP flows across
   potentially disjoint paths.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on 26 August 2021.

Amend, et al.            Expires 26 August 2021                 [Page 1]
Internet-Draft               Multipath DCCP                February 2021

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Multipath DCCP in the Networking Stack  . . . . . . . . .   3
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   4
     1.3.  MP-DCCP Concept . . . . . . . . . . . . . . . . . . . . .   4
     1.4.  Differences from Multipath TCP  . . . . . . . . . . . . .   5
     1.5.  Requirements Language . . . . . . . . . . . . . . . . . .   8
   2.  Operation Overview  . . . . . . . . . . . . . . . . . . . . .   8
   3.  MP-DCCP Protocol  . . . . . . . . . . . . . . . . . . . . . .   8
     3.1.  Multipath Capable Feature . . . . . . . . . . . . . . . .  11
     3.2.  Multipath Option  . . . . . . . . . . . . . . . . . . . .  11
       3.2.1.  MP_CONFIRM  . . . . . . . . . . . . . . . . . . . . .  12
       3.2.2.  MP_JOIN . . . . . . . . . . . . . . . . . . . . . . .  12
       3.2.3.  MP_FAST_CLOSE . . . . . . . . . . . . . . . . . . . .  13
       3.2.4.  MP_KEY  . . . . . . . . . . . . . . . . . . . . . . .  13
       3.2.5.  MP_SEQ  . . . . . . . . . . . . . . . . . . . . . . .  14
       3.2.6.  MP_HMAC . . . . . . . . . . . . . . . . . . . . . . .  14
       3.2.7.  MP_RTT  . . . . . . . . . . . . . . . . . . . . . . .  15
       3.2.8.  MP_ADDADDR  . . . . . . . . . . . . . . . . . . . . .  15
       3.2.9.  MP_REMOVEADDR . . . . . . . . . . . . . . . . . . . .  17
       3.2.10. MP_PRIO . . . . . . . . . . . . . . . . . . . . . . .  18
     3.3.  MP-DCCP Handshaking Procedure . . . . . . . . . . . . . .  18
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .  19
   5.  Interactions with Middleboxes . . . . . . . . . . . . . . . .  20
   6.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  21
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