DHCP and Router Advertisement Options for Encrypted DNS Discovery within Home Networks
draft-btw-add-home-10

Document Type Active Internet-Draft (individual)
Authors Mohamed Boucadair  , Tirumaleswar Reddy.K  , Dan Wing  , Neil Cook 
Last updated 2020-11-02
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ADD                                                         M. Boucadair
Internet-Draft                                                    Orange
Intended status: Standards Track                                T. Reddy
Expires: May 6, 2021                                              McAfee
                                                                 D. Wing
                                                                  Citrix
                                                                 N. Cook
                                                            Open-Xchange
                                                        November 2, 2020

DHCP and Router Advertisement Options for Encrypted DNS Discovery within
                             Home Networks
                         draft-btw-add-home-10

Abstract

   The document specifies new DHCP and Router Advertisement Options to
   discover encrypted DNS servers (e.g., DoH, DoT, DoQ).  Particularly,
   it allows to learn an Authentication Domain Name together with a list
   of IP addresses and optionally a port number to reach such encrypted
   DNS servers.

   This document focuses on encrypted DNS deployment within home
   networks.

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 May 6, 2021.

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Boucadair, et al.          Expires May 6, 2021                  [Page 1]
Internet-Draft       Encrypted DNS in Home Networks        November 2020

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Sample Target Deployment Scenarios  . . . . . . . . . . . . .   5
     3.1.  Managed CPEs  . . . . . . . . . . . . . . . . . . . . . .   5
       3.1.1.  Direct DNS  . . . . . . . . . . . . . . . . . . . . .   6
       3.1.2.  Proxied DNS . . . . . . . . . . . . . . . . . . . . .   7
     3.2.  Unmanaged CPEs  . . . . . . . . . . . . . . . . . . . . .   8
       3.2.1.  ISP-facing Unmanaged CPEs . . . . . . . . . . . . . .   8
       3.2.2.  Internal Unmanaged CPEs . . . . . . . . . . . . . . .   8
   4.  Encrypted DNS Discovery Options . . . . . . . . . . . . . . .   9
     4.1.  DHCPv6 Encrypted DNS Options  . . . . . . . . . . . . . .  11
     4.2.  DHCPv4 Encrypted DNS Option . . . . . . . . . . . . . . .  14
     4.3.  IPv6 RA Encrypted DNS Options . . . . . . . . . . . . . .  15
   5.  DoH URI Templates . . . . . . . . . . . . . . . . . . . . . .  18
   6.  Make Use of Discovered Encrypted DNS Server . . . . . . . . .  19
   7.  Hosting Encrypted DNS Forwarder in the CPE  . . . . . . . . .  20
     7.1.  Managed CPEs  . . . . . . . . . . . . . . . . . . . . . .  20
       7.1.1.  DNS Forwarders  . . . . . . . . . . . . . . . . . . .  20
       7.1.2.  ACME  . . . . . . . . . . . . . . . . . . . . . . . .  20
       7.1.3.  Auto-Upgrade Based on Domains and their Subdomains  .  20
     7.2.  Unmanaged CPEs  . . . . . . . . . . . . . . . . . . . . .  21
   8.  Legacy CPEs . . . . . . . . . . . . . . . . . . . . . . . . .  22
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  23
     9.1.  Spoofing Attacks  . . . . . . . . . . . . . . . . . . . .  23
     9.2.  Deletion Attacks  . . . . . . . . . . . . . . . . . . . .  24
     9.3.  Passive Attacks . . . . . . . . . . . . . . . . . . . . .  24
     9.4.  Wireless Security - Authentication Attacks  . . . . . . .  24
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  25
     10.1.  DHCPv6 Options . . . . . . . . . . . . . . . . . . . . .  25
     10.2.  DHCP Option  . . . . . . . . . . . . . . . . . . . . . .  25
     10.3.  RA Options . . . . . . . . . . . . . . . . . . . . . . .  25
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