DNS Push Notifications
draft-ietf-dnssd-push-19

Document Type Active Internet-Draft (dnssd WG)
Last updated 2019-06-03 (latest revision 2019-03-24)
Stream IETF
Intended RFC status Proposed Standard
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Send notices to Tim Wicinski <tjw.ietf@gmail.com>
Internet Engineering Task Force                              T. Pusateri
Internet-Draft                                              Unaffiliated
Intended status: Standards Track                             S. Cheshire
Expires: September 25, 2019                                   Apple Inc.
                                                          March 24, 2019

                         DNS Push Notifications
                        draft-ietf-dnssd-push-19

Abstract

   The Domain Name System (DNS) was designed to return matching records
   efficiently for queries for data that are relatively static.  When
   those records change frequently, DNS is still efficient at returning
   the updated results when polled, as long as the polling rate is not
   too high.  But there exists no mechanism for a client to be
   asynchronously notified when these changes occur.  This document
   defines a mechanism for a client to be notified of such changes to
   DNS records, called 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
   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 September 25, 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
   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

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   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.  Motivation  . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Transport . . . . . . . . . . . . . . . . . . . . . . . . . .   7
   5.  State Considerations  . . . . . . . . . . . . . . . . . . . .   8
   6.  Protocol Operation  . . . . . . . . . . . . . . . . . . . . .   9
     6.1.  Discovery . . . . . . . . . . . . . . . . . . . . . . . .  10
     6.2.  DNS Push Notification SUBSCRIBE . . . . . . . . . . . . .  14
       6.2.1.  SUBSCRIBE Request . . . . . . . . . . . . . . . . . .  14
       6.2.2.  SUBSCRIBE Response  . . . . . . . . . . . . . . . . .  17
     6.3.  DNS Push Notification Updates . . . . . . . . . . . . . .  20
       6.3.1.  PUSH Message  . . . . . . . . . . . . . . . . . . . .  20
     6.4.  DNS Push Notification UNSUBSCRIBE . . . . . . . . . . . .  25
       6.4.1.  UNSUBSCRIBE Message . . . . . . . . . . . . . . . . .  25
     6.5.  DNS Push Notification RECONFIRM . . . . . . . . . . . . .  27
       6.5.1.  RECONFIRM Message . . . . . . . . . . . . . . . . . .  28
     6.6.  DNS Stateful Operations TLV Context Summary . . . . . . .  30
     6.7.  Client-Initiated Termination  . . . . . . . . . . . . . .  31
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  32
     7.1.  Security Services . . . . . . . . . . . . . . . . . . . .  32
     7.2.  TLS Name Authentication . . . . . . . . . . . . . . . . .  32
     7.3.  TLS Session Resumption  . . . . . . . . . . . . . . . . .  33
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  33
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  34
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  34
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  34
     10.2.  Informative References . . . . . . . . . . . . . . . . .  36
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  38

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1.  Introduction

   Domain Name System (DNS) records may be updated using DNS Update
   [RFC2136].  Other mechanisms such as a Discovery Proxy [DisProx] can
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