TCP Extensions for Multipath Operation with Multiple Addresses
draft-ietf-mptcp-rfc6824bis-09

Document Type Active Internet-Draft (mptcp WG)
Last updated 2017-07-28
Replaces draft-bonaventure-mptcp-exp-option
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Internet Engineering Task Force                                  A. Ford
Internet-Draft                                                     Pexip
Obsoletes: 6824 (if approved)                                  C. Raiciu
Intended status: Standards Track            U. Politechnica of Bucharest
Expires: January 29, 2018                                     M. Handley
                                                       U. College London
                                                          O. Bonaventure
                                                U. catholique de Louvain
                                                               C. Paasch
                                                             Apple, Inc.
                                                           July 28, 2017

     TCP Extensions for Multipath Operation with Multiple Addresses
                     draft-ietf-mptcp-rfc6824bis-09

Abstract

   TCP/IP 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 TCP/IP session would
   improve resource usage within the network and, thus, improve user
   experience through higher throughput and improved resilience to
   network failure.

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

   This document specifies v1 of Multipath TCP, obsoleting v0 as
   specified in RFC6824 [RFC6824] through clarifications and
   modifications primarily driven by deployment experience.

Status of This Memo

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

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   and may be updated, replaced, or obsoleted by other documents at any

Ford, et al.            Expires January 29, 2018                [Page 1]
Internet-Draft                Multipath TCP                    July 2017

   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on January 29, 2018.

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Design Assumptions  . . . . . . . . . . . . . . . . . . .   4
     1.2.  Multipath TCP in the Networking Stack . . . . . . . . . .   5
     1.3.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   6
     1.4.  MPTCP Concept . . . . . . . . . . . . . . . . . . . . . .   6
     1.5.  Requirements Language . . . . . . . . . . . . . . . . . .   8
   2.  Operation Overview  . . . . . . . . . . . . . . . . . . . . .   8
     2.1.  Initiating an MPTCP Connection  . . . . . . . . . . . . .   8
     2.2.  Associating a New Subflow with an Existing MPTCP
           Connection  . . . . . . . . . . . . . . . . . . . . . . .   9
     2.3.  Informing the Other Host about Another Potential Address    9
     2.4.  Data Transfer Using MPTCP . . . . . . . . . . . . . . . .  10
     2.5.  Requesting a Change in a Path's Priority  . . . . . . . .  11
     2.6.  Closing an MPTCP Connection . . . . . . . . . . . . . . .  11
     2.7.  Notable Features  . . . . . . . . . . . . . . . . . . . .  12
   3.  MPTCP Protocol  . . . . . . . . . . . . . . . . . . . . . . .  12
     3.1.  Connection Initiation . . . . . . . . . . . . . . . . . .  13
     3.2.  Starting a New Subflow  . . . . . . . . . . . . . . . . .  20
     3.3.  General MPTCP Operation . . . . . . . . . . . . . . . . .  25
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