Happy Eyeballs Version 2: Better Connectivity Using Concurrency
draft-ietf-v6ops-rfc6555bis-07

Document Type Active Internet-Draft (v6ops WG)
Last updated 2017-10-31 (latest revision 2017-10-26)
Replaces draft-pauly-v6ops-happy-eyeballs-update
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Intended RFC status Proposed Standard
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Stream WG state Submitted to IESG for Publication (wg milestone: Nov 2017 - Update RFC 6555 with... )
Document shepherd Ron Bonica
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Send notices to Ron Bonica <rbonica@juniper.net>
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Network                                                      D. Schinazi
Internet-Draft                                                  T. Pauly
Obsoletes: 6555 (if approved)                                 Apple Inc.
Intended status: Standards Track                        October 25, 2017
Expires: April 28, 2018

    Happy Eyeballs Version 2: Better Connectivity Using Concurrency
                     draft-ietf-v6ops-rfc6555bis-07

Abstract

   Many communication protocols operated over the modern Internet use
   host names.  These often resolve to multiple IP addresses, each of
   which may have different performance and connectivity
   characteristics.  Since specific addresses or address families (IPv4
   or IPv6) may be blocked, broken, or sub-optimal on a network, clients
   that attempt multiple connections in parallel have a higher chance of
   establishing a connection sooner.  This document specifies
   requirements for algorithms that reduce this user-visible delay and
   provides an example algorithm, referred to as "Happy Eyeballs".  This
   document obsoletes the original algorithm description in [RFC6555].

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 https://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
   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 April 28, 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
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of

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   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   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  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   2.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Hostname Resolution Query Handling  . . . . . . . . . . . . .   4
     3.1.  Handling Multiple DNS Server Addresses  . . . . . . . . .   5
   4.  Sorting Addresses . . . . . . . . . . . . . . . . . . . . . .   5
   5.  Connection Attempts . . . . . . . . . . . . . . . . . . . . .   6
   6.  DNS Answer Changes during Happy Eyeballs Connection Setup . .   7
   7.  Supporting IPv6-only Networks with NAT64 and DNS64  . . . . .   8
     7.1.  IPv4 Address Literals . . . . . . . . . . . . . . . . . .   8
     7.2.  Host Names with Broken AAAA Records . . . . . . . . . . .   9
     7.3.  Virtual Private Networks  . . . . . . . . . . . . . . . .  10
   8.  Summary of Configurable Values  . . . . . . . . . . . . . . .  11
   9.  Limitations . . . . . . . . . . . . . . . . . . . . . . . . .  11
     9.1.  Path Maximum Transmission Unit Discovery  . . . . . . . .  12
     9.2.  Application Layer . . . . . . . . . . . . . . . . . . . .  12
     9.3.  Hiding Operational Issues . . . . . . . . . . . . . . . .  12
   10. Security Considerations . . . . . . . . . . . . . . . . . . .  12
   11. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
   12. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  12
   13. References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     13.1.  Normative References . . . . . . . . . . . . . . . . . .  13
     13.2.  Informative References . . . . . . . . . . . . . . . . .  14
   Appendix A.  Differences from RFC6555 . . . . . . . . . . . . . .  14
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  15

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1.  Introduction

   Many communication protocols operated over the modern Internet use
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