DNS Long-Lived Queries
draft-sekar-dns-llq-03

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Last updated 2019-03-04
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Network Working Group                                        S. Cheshire
Internet-Draft                                               M. Krochmal
Intended status: Informational                                Apple Inc.
Expires: September 5, 2019                                 March 4, 2019

                         DNS Long-Lived Queries
                         draft-sekar-dns-llq-03

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
   2007 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   the LLQ protocol was superseded by the IETF Standards Track RFC "DNS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.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on September 5, 2019.

Copyright Notice

   Copyright (c) 2019 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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   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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Cheshire & Krochmal     Expires September 5, 2019               [Page 1]
Internet-Draft           DNS Long-Lived Queries               March 2019

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
     4.1.  Server Address and Port Identification  . . . . . . . . .   7
     4.2.  Client Address and Port Identification  . . . . . . . . .   8
   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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