Happy EarBalls: Success with Dual-Stack, Connection-Oriented SIP
draft-worley-sip-he-connection-01

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SIPCORE                                                     O. Johansson
Internet-Draft                                                 Edvina AB
Intended status: Standards Track                            G. Salgueiro
Expires: June 15, 2017                                     Cisco Systems
                                                               D. Worley
                                                                 Ariadne
                                                       December 12, 2016

    Happy EarBalls: Success with Dual-Stack, Connection-Oriented SIP
                   draft-worley-sip-he-connection-01

Abstract

   The Session Initiation Protocol (SIP) supports multiple transports
   running both over IPv4 and IPv6 protocols.  In more and more cases, a
   SIP user agent (UA) is connected to multiple network interfaces.  In
   these cases setting up a connection from a dual stack client to a
   dual stack server may suffer from the issues described in RFC 6555
   [RFC6555] ("Happy Eyeballs") - significant delays in the process of
   setting up a working flow to a server.  This negatively affects user
   experience.

   This document builds on RFC 6555 and explains how a [RFC3261]
   compliant SIP implementation can minimize delays when contacting a
   host name (obtained by using DNS NAPTR and SRV lookups) in a dual
   stack network using connection-oriented transport protocols.

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
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on June 15, 2017.

Johansson, et al.         Expires June 15, 2017                 [Page 1]
Internet-Draft     Connection-Oriented Happy EarBalls      December 2016

Copyright Notice

   Copyright (c) 2016 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology and Conventions Used in This Document . . . . . .   3
   3.  DNS Procedures in a Dual-Stack Network  . . . . . . . . . . .   4
   4.  Establishing a Connection . . . . . . . . . . . . . . . . . .   5
     4.1.  Requirements  . . . . . . . . . . . . . . . . . . . . . .   6
       4.1.1.  Address Preferences . . . . . . . . . . . . . . . . .   6
       4.1.2.  Stateful Behavior . . . . . . . . . . . . . . . . . .   6
       4.1.3.  Reset on Network (Re-)Initialization  . . . . . . . .   7
       4.1.4.  Abandon Non-Winning Connections . . . . . . . . . . .   7
   5.  Using an Existing Connection  . . . . . . . . . . . . . . . .   8
   6.  Additional Considerations . . . . . . . . . . . . . . . . . .   8
     6.1.  Preemtive Actions . . . . . . . . . . . . . . . . . . . .   8
     6.2.  Determining the Type of an Address  . . . . . . . . . . .   9
     6.3.  Debugging and Troubleshooting . . . . . . . . . . . . . .   9
     6.4.  Three or More Interfaces  . . . . . . . . . . . . . . . .   9
     6.5.  Multiple A and AAAA Resource Records  . . . . . . . . . .   9
     6.6.  Connection Timeout  . . . . . . . . . . . . . . . . . . .  10
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   9.  History . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
     9.1.  Changes from draft-worley-sip-he-connection-00 to draft-
           worley-sip-he-connection-01 . . . . . . . . . . . . . . .  11
     9.2.  Changes from draft-johansson-sip-he-connection-01 to
           draft-worley-sip-he-connection-00 . . . . . . . . . . . .  11
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  11
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