DNS Transport over TCP - Operational Requirements
draft-ietf-dnsop-dns-tcp-requirements-01

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Last updated 2017-11-14
Replaces draft-kristoff-dnsop-dns-tcp-requirements
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Domain Name System Operations                                J. Kristoff
Internet-Draft                                         DePaul University
Intended status: Best Current Practice                        D. Wessels
Expires: May 17, 2018                                           Verisign
                                                       November 13, 2017

           DNS Transport over TCP - Operational Requirements
                draft-ietf-dnsop-dns-tcp-requirements-01

Abstract

   This document encourages the practice of permitting DNS messages to
   be carried over TCP on the Internet.  It also describes some of the
   consequences of this behavior and the potential operational issues
   that can arise when this best common practice is not upheld.

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 17, 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
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Kristoff & Wessels        Expires May 17, 2018                  [Page 1]
Internet-Draft           DNS Transport over TCP            November 2017

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   2.  Background  . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Uneven Transport Usage and Preference . . . . . . . . . .   3
     2.2.  Waiting for Large Messages and Reliability  . . . . . . .   4
     2.3.  EDNS0 . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.4.  Fragmentation and Truncation  . . . . . . . . . . . . . .   5
     2.5.  "Only Zone Transfers Use TCP" . . . . . . . . . . . . . .   6
   3.  DNS over TCP Requirements . . . . . . . . . . . . . . . . . .   6
   4.  Network and System Considerations . . . . . . . . . . . . . .   7
   5.  DNS over TCP Filtering Risks  . . . . . . . . . . . . . . . .   7
     5.1.  DNS Wedgie  . . . . . . . . . . . . . . . . . . . . . . .   8
     5.2.  DNS Root Zone KSK Rollover  . . . . . . . . . . . . . . .   8
     5.3.  DNS-over-TLS  . . . . . . . . . . . . . . . . . . . . . .   8
   6.  Logging and Monitoring  . . . . . . . . . . . . . . . . . . .   8
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   8
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   10. Privacy Considerations  . . . . . . . . . . . . . . . . . . .   9
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     11.1.  Normative References . . . . . . . . . . . . . . . . . .   9
     11.2.  Informative References . . . . . . . . . . . . . . . . .   9
   Appendix A.  Standards Related to DNS Transport over TCP  . . . .  13
     A.1.  TODO - additional, relevant RFCs  . . . . . . . . . . . .  13
     A.2.  IETF RFC 7477 - Child-to-Parent Synchronization in DNS  .  13
     A.3.  IETF RFC 7720 - DNS Root Name Service Protocol and
           Deployment Requirements . . . . . . . . . . . . . . . . .  13
     A.4.  IETF RFC 7766 - DNS Transport over TCP - Implementation
           Requirements  . . . . . . . . . . . . . . . . . . . . . .  13
     A.5.  IETF RFC 7828 - The edns-tcp-keepalive EDNS0 Option . . .  14
     A.6.  IETF RFC 7858 - Specification for DNS over Transport
           Layer Security (TLS)  . . . . . . . . . . . . . . . . . .  14
     A.7.  IETF RFC 7873 - Domain Name System (DNS) Cookies  . . . .  14
     A.8.  IETF RFC 7901 - CHAIN Query Requests in DNS . . . . . . .  14
     A.9.  IETF RFC 8027 - DNSSEC Roadblock Avoidance  . . . . . . .  14
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