Discussion of Requirements for ADD
draft-zhang-add-requirement-discusses-00

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Internet Engineering Task Force                                 M. Zhang
Internet-Draft                                         December 25, 2020
Intended status: Informational
Expires: June 28, 2021

                   Discussion of Requirements for ADD
                draft-zhang-add-requirement-discusses-00

Abstract

   This document discusses various usage scenarios and corresponding
   requirements for discovering and using encrypted DNS technology.

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 June 28, 2021.

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   Copyright (c) 2020 IETF Trust and the persons identified as the
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Internet-Draft     Discussion of Requirements for ADD      December 2020

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions Used in This Document . . . . . . . . . . . . . .   2
   3.  Discover and use of encrypted DNS services  . . . . . . . . .   2
     3.1.  The client automatically obtains DNS resolution service .   3
     3.2.  The client has been configured with parameters  . . . . .   3
     3.3.  Configuration examples  . . . . . . . . . . . . . . . . .   3
   4.  Encrypted DNS resolution service list . . . . . . . . . . . .   4
     4.1.  Provide a public encrypted DNS resolution service address
           list  . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     4.2.  Provide encrypted DNS resolution configuration for some
           specific domain names . . . . . . . . . . . . . . . . . .   4
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   7.  Acknowledgment  . . . . . . . . . . . . . . . . . . . . . . .   4
   8.  Informative References  . . . . . . . . . . . . . . . . . . .   4
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   Several DNS encryption technologies have been introduced, including
   DNS-over-TLS and DNS-over-HTTPS and so on.  The work of the Adaptive
   DNS Discovery working group includes supporting client discovery of
   encrypted DNS resolution services and communication mechanisms for
   selection decisions.

   Since the proposal of the draft plan should be guided by the existing
   problems, the working group should first reach a consensus on the
   problems to be solved and the principles applicable to each problem,
   and then promote follow-up work on this basis.

   This document discusses various usage scenarios and corresponding
   requirements for discovering and using encrypted DNS technology.

2.  Conventions Used in This Document

   Encrypted DNS: DNS-over-HTTPS[RFC8484], DNS-over-TLS[RFC7858] or any
   other encrypted DNS technology that the IETF may publish, for
   example, DNS-over-QUIC [I-D.ietf-dprive-dnsoquic].

3.  Discover and use of encrypted DNS services

   The DNS client accesses the recursive server with discovery function,
   and the discussion is divided into the following situations:

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3.1.  The client automatically obtains DNS resolution service

   1) Ordinary DNS resolution service

   The client can automatically obtain the common DNS recursive
   resolution server address through DHCP.

   2) Encrypted DNS resolution service

   The client can choose several types of encryption resolution services
   currently provided (such as DOH/DOT, etc.), and accept the default
   configuration of the recursive server.

   The encrypted DNS recursive resolution server address can be