DNS Transport over TCP - Operational Requirements
draft-ietf-dnsop-dns-tcp-requirements-02

Document Type Active Internet-Draft (dnsop WG)
Last updated 2018-05-17
Replaces draft-kristoff-dnsop-dns-tcp-requirements
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Domain Name System Operations                                J. Kristoff
Internet-Draft                                         DePaul University
Updates: 1123 (if approved)                                   D. Wessels
Intended status: Best Current Practice                          Verisign
Expires: November 17, 2018                                  May 16, 2018

           DNS Transport over TCP - Operational Requirements
                draft-ietf-dnsop-dns-tcp-requirements-02

Abstract

   This document encourages the practice of permitting DNS messages to
   be carried over TCP on the Internet.  It also considers the
   consequences with this form of DNS communication 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.

   Internet-Drafts are working documents of the Internet Engineering
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   time.  It is inappropriate to use Internet-Drafts as reference
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   This Internet-Draft will expire on November 17, 2018.

Copyright Notice

   Copyright (c) 2018 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
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of

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

   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.  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 . . . . . . . . . . . . . .   8
     4.1.  Connection Admission  . . . . . . . . . . . . . . . . . .   8
     4.2.  Connection Management . . . . . . . . . . . . . . . . . .   9
     4.3.  Connection Termination  . . . . . . . . . . . . . . . . .   9
   5.  DNS over TCP Filtering Risks  . . . . . . . . . . . . . . . .  10
     5.1.  DNS Wedgie  . . . . . . . . . . . . . . . . . . . . . . .  10
     5.2.  DNS Root Zone KSK Rollover  . . . . . . . . . . . . . . .  11
     5.3.  DNS-over-TLS  . . . . . . . . . . . . . . . . . . . . . .  11
   6.  Logging and Monitoring  . . . . . . . . . . . . . . . . . . .  11
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  12
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
   10. Privacy Considerations  . . . . . . . . . . . . . . . . . . .  12
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  13
     11.2.  Informative References . . . . . . . . . . . . . . . . .  13
   Appendix A.  Standards Related to DNS Transport over TCP  . . . .  17
     A.1.  TODO - additional, relevant RFCs  . . . . . . . . . . . .  17
     A.2.  IETF RFC 5936 - DNS Zone Transfer Protocol (AXFR) . . . .  17
     A.3.  IETF RFC 6304 - AS112 Nameserver Operations . . . . . . .  17
     A.4.  IETF RFC 6762 - Multicast DNS . . . . . . . . . . . . . .  17
     A.5.  IETF RFC 6950 - Architectural Considerations on
           Application Features in the DNS . . . . . . . . . . . . .  18
     A.6.  IETF RFC 7477 - Child-to-Parent Synchronization in DNS  .  18
     A.7.  IETF RFC 7720 - DNS Root Name Service Protocol and
           Deployment Requirements . . . . . . . . . . . . . . . . .  18
     A.8.  IETF RFC 7766 - DNS Transport over TCP - Implementation
           Requirements  . . . . . . . . . . . . . . . . . . . . . .  18
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