Hybrid Unicast/Multicast DNS-Based Service Discovery
draft-ietf-dnssd-hybrid-05

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Document Type Active Internet-Draft (dnssd WG)
Last updated 2016-11-16 (latest revision 2016-10-31)
Replaces draft-cheshire-dnssd-hybrid
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Internet Engineering Task Force                              S. Cheshire
Internet-Draft                                                Apple Inc.
Intended status: Standards Track                       November 16, 2016
Expires: May 20, 2017

          Hybrid Unicast/Multicast DNS-Based Service Discovery
                       draft-ietf-dnssd-hybrid-05

Abstract

   This document specifies a mechanism that uses Multicast DNS to
   automatically populate the wide-area unicast Domain Name System
   namespace with records describing devices and services found on the
   local link.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on May 20, 2017.

Copyright Notice

   Copyright (c) 2016 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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Cheshire                  Expires May 20, 2017                  [Page 1]
Internet-Draft     Hybrid uDNS/mDNS Service Discovery      November 2016

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Operational Analogy  . . . . . . . . . . . . . . . . . . . . .  6
   3.  Conventions and Terminology Used in this Document  . . . . . .  7
   4.  Compatibility Considerations . . . . . . . . . . . . . . . . .  7
   5.  Hybrid Proxy Operation . . . . . . . . . . . . . . . . . . . .  8
     5.1.  Delegated Subdomain for Service Discovery Records  . . . .  9
     5.2.  Domain Enumeration . . . . . . . . . . . . . . . . . . . . 10
       5.2.1.  Domain Enumeration via Unicast Queries . . . . . . . . 10
       5.2.2.  Domain Enumeration via Multicast Queries . . . . . . . 12
     5.3.  Delegated Subdomain for LDH Host Names . . . . . . . . . . 13
     5.4.  Delegated Subdomain for Reverse Mapping  . . . . . . . . . 15
     5.5.  Data Translation . . . . . . . . . . . . . . . . . . . . . 16
       5.5.1.  DNS TTL limiting . . . . . . . . . . . . . . . . . . . 16
       5.5.2.  Suppressing Unusable Records . . . . . . . . . . . . . 17
       5.5.3.  NSEC and NSEC3 queries . . . . . . . . . . . . . . . . 18
       5.5.4.  Text Encoding Translation  . . . . . . . . . . . . . . 18
       5.5.5.  Application-Specific Data Translation  . . . . . . . . 18
     5.6.  Answer Aggregation . . . . . . . . . . . . . . . . . . . . 20
   6.  Administrative DNS Records . . . . . . . . . . . . . . . . . . 23
     6.1.  DNS SOA (Start of Authority) Record  . . . . . . . . . . . 23
     6.2.  DNS NS Records . . . . . . . . . . . . . . . . . . . . . . 23
     6.3.  DNS SRV Records  . . . . . . . . . . . . . . . . . . . . . 23
   7.  DNSSEC Issues  . . . . . . . . . . . . . . . . . . . . . . . . 24
     7.1.  On-line signing only . . . . . . . . . . . . . . . . . . . 24
     7.2.  NSEC and NSEC3 Records . . . . . . . . . . . . . . . . . . 24
   8.  IPv6 Considerations  . . . . . . . . . . . . . . . . . . . . . 25
   9.  Security Considerations  . . . . . . . . . . . . . . . . . . . 25
     9.1.  Authenticity . . . . . . . . . . . . . . . . . . . . . . . 25
     9.2.  Privacy  . . . . . . . . . . . . . . . . . . . . . . . . . 25
     9.3.  Denial of Service  . . . . . . . . . . . . . . . . . . . . 26
   10. Intelectual Property Rights  . . . . . . . . . . . . . . . . . 26
   11. IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 26
   12. Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 27
   13. References . . . . . . . . . . . . . . . . . . . . . . . . . . 27
     13.1. Normative References . . . . . . . . . . . . . . . . . . . 27
     13.2. Informative References . . . . . . . . . . . . . . . . . . 28
   Appendix A.  Implementation Status . . . . . . . . . . . . . . . . 30
     A.1.  Already Implemented and Deployed . . . . . . . . . . . . . 30
     A.2.  Already Implemented  . . . . . . . . . . . . . . . . . . . 30
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