DNS Long-Lived Queries
draft-sekar-dns-llq-05

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Document Type Active Internet-Draft (individual)
Last updated 2019-08-22 (latest revision 2019-08-16)
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Intended RFC status Informational
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Network Working Group                                        S. Cheshire
Internet-Draft                                               M. Krochmal
Intended status: Informational                                Apple Inc.
Expires: February 17, 2020                               August 16, 2019

                         DNS Long-Lived Queries
                         draft-sekar-dns-llq-05

Abstract

   DNS Long-Lived Queries (LLQ) is a protocol for extending the DNS
   protocol to support change notification, thus allowing clients to
   learn about changes to DNS data without polling the server.  From
   2005 onwards, LLQ was implemented in Apple products including Mac OS
   X, Bonjour for Windows, and AirPort wireless base stations.  In 2019,
   the LLQ protocol was superseded by the IETF Standards Track RFC "DNS
   Push Notifications", which builds on experience gained with the LLQ
   protocol to create a superior replacement.

   The existing deployed LLQ protocol is documented here to give
   background regarding the operational experience that informed the
   development of DNS Push Notifications, and to help facilitate a
   smooth transition from LLQ to DNS Push Notifications.

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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   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 February 17, 2020.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Cheshire & Krochmal     Expires February 17, 2020               [Page 1]
Internet-Draft           DNS Long-Lived Queries              August 2019

   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
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Transition to DNS Push Notifications  . . . . . . . . . .   4
   2.  Conventions and Terminology Used in this Document . . . . . .   4
   3.  Mechanisms  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     3.1.  New Assigned Numbers  . . . . . . . . . . . . . . . . . .   5
     3.2.  Opt-RR Format . . . . . . . . . . . . . . . . . . . . . .   6
   4.  LLQ Address and Port Identification . . . . . . . . . . . . .   7
   5.  LLQ Setup . . . . . . . . . . . . . . . . . . . . . . . . . .   9
     5.1.  Setup Message Retransmission  . . . . . . . . . . . . . .   9
     5.2.  LLQ Setup Four-Way Handshake  . . . . . . . . . . . . . .   9
       5.2.1.  Setup Request . . . . . . . . . . . . . . . . . . . .  10
       5.2.2.  Setup Challenge . . . . . . . . . . . . . . . . . . .  11
       5.2.3.  Challenge Response  . . . . . . . . . . . . . . . . .  14
       5.2.4.  ACK + Answers . . . . . . . . . . . . . . . . . . . .  15
     5.3.  Resource Record TTLs  . . . . . . . . . . . . . . . . . .  16
   6.  Event Responses . . . . . . . . . . . . . . . . . . . . . . .  17
     6.1.  Add Events  . . . . . . . . . . . . . . . . . . . . . . .  18
     6.2.  Remove Events . . . . . . . . . . . . . . . . . . . . . .  18
     6.3.  Gratuitous Response Acknowledgments . . . . . . . . . . .  18
   7.  LLQ Lease-Life Expiration . . . . . . . . . . . . . . . . . .  19
     7.1.  Refresh Request . . . . . . . . . . . . . . . . . . . . .  19
     7.2.  LLQ Refresh Acknowledgment  . . . . . . . . . . . . . . .  20
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  21
     8.1.  Server DOS  . . . . . . . . . . . . . . . . . . . . . . .  21
     8.2.  Client Packet Storms  . . . . . . . . . . . . . . . . . .  21
     8.3.  Spoofing  . . . . . . . . . . . . . . . . . . . . . . . .  21
   9.  Problems with the LLQ Protocol  . . . . . . . . . . . . . . .  22
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  23
   11. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  23
   12. References  . . . . . . . . . . . . . . . . . . . . . . . . .  23
     12.1.  Normative References . . . . . . . . . . . . . . . . . .  23
     12.2.  Informative References . . . . . . . . . . . . . . . . .  24
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  25

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