Authoritative DNS-over-TLS Operational Considerations
draft-hal-adot-operational-considerations-02

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dprive or dnsop                                             K. Henderson
Internet-Draft                                                  Verisign
Intended status: Informational                                  T. April
Expires: February 14, 2020                                        Akamai
                                                            J. Livingood
                                                                 Comcast
                                                         August 13, 2019

         Authoritative DNS-over-TLS Operational Considerations
              draft-hal-adot-operational-considerations-02

Abstract

   DNS over TLS (DoT) has been gaining attention, primarily as a means
   of communication between stub resolvers and recursive resolvers.
   There have also been discussions and experiments involving the use of
   DoT to communicate with authoritative nameservers (Authoritative DNS
   over TLS or "ADoT"), including communication between recursive and
   authoritative resolvers.  However, we have identified a number of
   operational concerns with ADoT that have arisen as DNS operators have
   begun to experiment with and prepare for deploying DoT.  These
   operational concerns need to be addressed prior to ADoT's deployment
   at scale by DNS operators in order to maintain the stability and
   resilience of the global DNS.  The document also provides some
   suggested next steps to advance the operator community's
   understanding of ADoT's operational impact.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on February 14, 2020.

Henderson, et al.       Expires February 14, 2020               [Page 1]
Internet-Draft       ADoT Operational Considerations         August 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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Background and Motivation . . . . . . . . . . . . . . . .   3
       1.1.1.  Why operational considerations are so important for
               ADoT  . . . . . . . . . . . . . . . . . . . . . . . .   3
       1.1.2.  Other considerations related to ADoT  . . . . . . . .   4
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
     2.1.  Requirements Language . . . . . . . . . . . . . . . . . .   5
     2.2.  Definitions . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Key Issues and Questions  . . . . . . . . . . . . . . . . . .   6
     3.1.  Signaling Support for ADoT  . . . . . . . . . . . . . . .   6
     3.2.  Port number . . . . . . . . . . . . . . . . . . . . . . .   6
     3.3.  TLS version . . . . . . . . . . . . . . . . . . . . . . .   7
     3.4.  Resumptions . . . . . . . . . . . . . . . . . . . . . . .   7
     3.5.  Operational Monitoring  . . . . . . . . . . . . . . . . .   8
     3.6.  Architecture  . . . . . . . . . . . . . . . . . . . . . .   8
     3.7.  Socket efficiency/tuning considerations . . . . . . . . .   8
     3.8.  Post-Quantum Security . . . . . . . . . . . . . . . . . .   9
   4.  Suggestions for further research and development  . . . . . .   9
     4.1.  Required studies and analysis . . . . . . . . . . . . . .   9
     4.2.  Authoritative DNS over TLS (ADoT) Profile . . . . . . . .  10
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     6.1.  Informative References  . . . . . . . . . . . . . . . . .  10
     6.2.  URIs  . . . . . . . . . . . . . . . . . . . . . . . . . .  13
   Appendix A.  Acknowledgements . . . . . . . . . . . . . . . . . .  13
   Appendix B.  Change Log . . . . . . . . . . . . . . . . . . . . .  13