Operator-Assisted Relay Service Architecture (OARS)
draft-wang-rtcweb-oars-01

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RTCWEB Working Group                                           A.Wang
Internet Draft                                           China Telecom
                                                                  B.Liu
                                                    Huawei Technologies
                                                               J.Uberti
                                                                 Google
                                                              Peng.Ding
                                                          China Telecom
Intended status: Standard Track                          March 13, 2017
Expires: September 12, 2017

            Operator-Assisted Relay Service Architecture (OARS)
                       draft-wang-rtcweb-oars-01.txt

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<Wang,Liu,Uberti&Ding> Expires September 10, 2017              [Page 1]
Internet-Draft  Operator-Assisted Relay Service Architecture (OARS)
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Abstract

    This document proposes a new relay-based NAT traversal architecture
    called OARS which could simplify the data communication process
    between two hosts that locates behind some non-BEHAVE compliant
    [RFC4787] [RFC5382] NAT devices.  The key mechanism in OARS is the
    newly defined "Couple" operation (using STUN [RFC5389] message
    format) which allows the Relay servers to be easily incorporated
    into existing CGN/CDN nodes which are already deployed within the
    network in a distributed manner.
Table of Contents

   1. Introduction ................................................ 3
      1.1. Motivations ............................................ 3
      1.2. Relationship with TURN.................................. 5
   2. Conventions used in this document............................ 5
   3. Solution Overview ........................................... 6
      3.1. Reference Architecture of OARS ..........................6
      3.2. Solution Rationale...................................... 7
         3.2.1. Relay Selector Reflection and Selection ............7
         3.2.2. Relay Selection.................................... 8
         3.2.3. Forming "Couple" Command........................... 9
         3.2.4. Data Relay......................................... 9
   4. New STUN Method Definition .................................. 10
      4.1. Couple Operation ....................................... 10
      4.2. Couple Operation Packet Format ......................... 10
   5. Detailed Example ............................................ 12
      5.1. Procedures of Communication Traversing Symmetric NATs... 12
      5.2. Procedures of IPv4 and IPv6 Host Communication.......... 13
   6. OARS Benefits ............................................... 14
   7. OARS Deployment Considerations............................... 16

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