Encrypted DNS Discovery and Deployment Considerations for Home Networks
draft-btw-add-home-07

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Last updated 2020-07-10
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ADD                                                         M. Boucadair
Internet-Draft                                                    Orange
Intended status: Standards Track                                T. Reddy
Expires: January 11, 2021                                         McAfee
                                                                 D. Wing
                                                                  Citrix
                                                                 N. Cook
                                                            Open-Xchange
                                                           July 10, 2020

Encrypted DNS Discovery and Deployment Considerations for Home Networks
                         draft-btw-add-home-07

Abstract

   This document discusses DoT/DoH deployment considerations for home
   networks.  It particularly sketches the required steps to use DoT/DoH
   capabilities provided by local networks.

   The document specifies new DHCP and Router Advertisement Options to
   convey a DNS Authentication Domain Name.

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
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on January 11, 2021.

Copyright Notice

   Copyright (c) 2020 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

Boucadair, et al.       Expires January 11, 2021                [Page 1]
Internet-Draft          DoH/DoT in Home Networks               July 2020

   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Sample Deployment Scenarios . . . . . . . . . . . . . . . . .   5
     3.1.  Managed CPEs  . . . . . . . . . . . . . . . . . . . . . .   5
     3.2.  Unmanaged CPEs  . . . . . . . . . . . . . . . . . . . . .   7
   4.  DNS Reference Identifier Option . . . . . . . . . . . . . . .   8
     4.1.  DHCPv6 DNS Reference Identifier Option  . . . . . . . . .   9
     4.2.  DHCP DNS Reference Identifier Option  . . . . . . . . . .  11
     4.3.  RA DNS Reference Identifier Option  . . . . . . . . . . .  12
   5.  DoH URI Templates . . . . . . . . . . . . . . . . . . . . . .  13
   6.  Locating DoH/DoT Servers  . . . . . . . . . . . . . . . . . .  13
     6.1.  DoT/DoH Auto-Upgrade  . . . . . . . . . . . . . . . . . .  14
     6.2.  Other Deployment Options  . . . . . . . . . . . . . . . .  14
   7.  Hosting DoH/DoT Forwarder in the CPE  . . . . . . . . . . . .  15
     7.1.  Managed CPEs  . . . . . . . . . . . . . . . . . . . . . .  15
       7.1.1.  ACME  . . . . . . . . . . . . . . . . . . . . . . . .  15
       7.1.2.  Auto-Upgrade based on Domains and their Sub-domains .  15
     7.2.  Unmanaged CPEs  . . . . . . . . . . . . . . . . . . . . .  16
   8.  Legacy CPEs . . . . . . . . . . . . . . . . . . . . . . . . .  17
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  17
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  19
     10.1.  DHCPv6 Option  . . . . . . . . . . . . . . . . . . . . .  19
     10.2.  DHCP Option  . . . . . . . . . . . . . . . . . . . . . .  19
     10.3.  RA Option  . . . . . . . . . . . . . . . . . . . . . . .  20
   11. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  20
   12. References  . . . . . . . . . . . . . . . . . . . . . . . . .  20
     12.1.  Normative References . . . . . . . . . . . . . . . . . .  20
     12.2.  Informative References . . . . . . . . . . . . . . . . .  21
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  24

1.  Introduction

   Internet Service Providers (ISPs) traditionally provide DNS resolvers
   to their customers.  Typically, ISPs deploy the following mechanisms
   to advertise a list of DNS Recursive DNS server(s) to their
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