An Update to Happy Eyeballs
draft-pauly-v6ops-happy-eyeballs-update-01

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Network                                                         T. Pauly
Internet-Draft                                               D. Schinazi
Intended status: Standards Track                              Apple Inc.
Expires: September 13, 2017                               March 12, 2017

                      An Update to Happy Eyeballs
               draft-pauly-v6ops-happy-eyeballs-update-01

Abstract

   "Happy Eyeballs" (RFC6555) is the name for a technique of reducing
   user-visible delays on dual-stack hosts.  Since one address family
   (IPv4 or IPv6) may be blocked, broken, or sub-optimal on a network,
   clients that attempt connections for both address families in
   parallel have a higher chance of establishing a connection sooner.
   Now that this approach has been deployed at scale and measured for
   several years, the algorithm specification can be refined to improve
   its reliability and generalization.

Status of This Memo

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   This Internet-Draft will expire on September 13, 2017.

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   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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Pauly & Schinazi       Expires September 13, 2017               [Page 1]
Internet-Draft         An Update to Happy Eyeballs            March 2017

   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   2
   2.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Hostname Resolution Query Handling  . . . . . . . . . . . . .   3
     3.1.  Handling Multiple DNS Server Addresses  . . . . . . . . .   4
   4.  Sorting Addresses . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Connection Attempts . . . . . . . . . . . . . . . . . . . . .   5
   6.  DNS Answer Changes during Happy Eyeballs Connection Setup . .   5
   7.  Summary of Configurable Values  . . . . . . . . . . . . . . .   6
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   10. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   6
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     11.1.  Normative References . . . . . . . . . . . . . . . . . .   7
     11.2.  Informative References . . . . . . . . . . . . . . . . .   7
   Appendix A.  Differences from RFC6555 . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   "Happy Eyeballs" [RFC6555] is the name for a technique of reducing
   user-visible delays on dual-stack hosts.  Since one address family
   (IPv4 or IPv6) may be blocked, broken, or sub-optimal on a network,
   clients that attempt connections for both address families in
   parallel have a higher chance of establishing a connection sooner.
   Now that this approach has been deployed at scale and measured for
   several years, the algorithm specification can be refined to improve
   its reliability and generalization.

   This document recommends an algorithm of racing resolved addresses
   that has several stages of ordering and racing to avoid delays to the
   user whenever possible, while preferring the use of IPv6.
   Specifically, it discusses how to handle DNS queries when starting a
   connection on a dual-stack client, how to create an ordered list of
   addresses to which to attempt connections, and how to race the
   connection attempts.

1.1.  Requirements Language
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