DHCP and Router Advertisement Options for the Discovery of Network-designated Resolvers (DNR)
draft-ietf-add-dnr-00

Document Type Active Internet-Draft (add WG)
Authors Mohamed Boucadair  , Tirumaleswar Reddy.K  , Dan Wing  , Neil Cook  , Tommy Jensen 
Last updated 2021-02-22
Replaces draft-btw-add-home
Stream Internent Engineering Task Force (IETF)
Intended RFC status (None)
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- GitHub Repository
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Stream WG state WG Document
On Agenda add at IETF-110
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ADD                                                         M. Boucadair
Internet-Draft                                                    Orange
Intended status: Standards Track                                T. Reddy
Expires: August 26, 2021                                          McAfee
                                                                 D. Wing
                                                                  Citrix
                                                                 N. Cook
                                                            Open-Xchange
                                                               T. Jensen
                                                               Microsoft
                                                       February 22, 2021

  DHCP and Router Advertisement Options for the Discovery of Network-
                       designated Resolvers (DNR)
                         draft-ietf-add-dnr-00

Abstract

   The document specifies new DHCP and IPv6 Router Advertisement options
   to discover encrypted DNS servers (e.g., DNS-over-HTTPS, DNS-over-
   TLS, DNS-over-QUIC).  Particularly, it allows to learn an
   authentication domain name together with a list of IP addresses and a
   port number to reach such encrypted DNS servers.  The discovery of
   DNS-over-HTTPS URI Templates is also discussed.

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
   working documents as Internet-Drafts.  The list of current Internet-
   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 August 26, 2021.

Copyright Notice

   Copyright (c) 2021 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Boucadair, et al.        Expires August 26, 2021                [Page 1]
Internet-Draft  Discovery of Network-designated Resolvers  February 2021

   This document is subject to BCP 78 and the IETF Trust's Legal
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   (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
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Overview and Rationale  . . . . . . . . . . . . . . . . . . .   4
   4.  DHCPv6 Encrypted DNS Options  . . . . . . . . . . . . . . . .   6
     4.1.  Encrypted DNS ADN Option  . . . . . . . . . . . . . . . .   6
     4.2.  Encrypted DNS Address Option  . . . . . . . . . . . . . .   7
     4.3.  DHCPv6 Client Behavior  . . . . . . . . . . . . . . . . .   9
   5.  DHCPv4 Encrypted DNS Option . . . . . . . . . . . . . . . . .   9
     5.1.  Encrypted DNS Option  . . . . . . . . . . . . . . . . . .   9
     5.2.  DHCPv4 Client Behavior  . . . . . . . . . . . . . . . . .  11
   6.  IPv6 RA Encrypted DNS Options . . . . . . . . . . . . . . . .  11
     6.1.  Encrypted DNS ADN Option  . . . . . . . . . . . . . . . .  12
     6.2.  Encrypted DNS Address Option  . . . . . . . . . . . . . .  13
   7.  DoH URI Templates . . . . . . . . . . . . . . . . . . . . . .  14
   8.  Hosting Encrypted DNS Forwarder in Local Networks . . . . . .  16
     8.1.  Managed CPEs  . . . . . . . . . . . . . . . . . . . . . .  16
       8.1.1.  DNS Forwarders  . . . . . . . . . . . . . . . . . . .  16
       8.1.2.  ACME  . . . . . . . . . . . . . . . . . . . . . . . .  16
       8.1.3.  Auto-Upgrade Based on Domains and their Subdomains  .  16
     8.2.  Unmanaged CPEs  . . . . . . . . . . . . . . . . . . . . .  17
   9.  Legacy CPEs . . . . . . . . . . . . . . . . . . . . . . . . .  18
   10. Security Considerations . . . . . . . . . . . . . . . . . . .  18
     10.1.  Spoofing Attacks . . . . . . . . . . . . . . . . . . . .  18
     10.2.  Deletion Attacks . . . . . . . . . . . . . . . . . . . .  19
     10.3.  Passive Attacks  . . . . . . . . . . . . . . . . . . . .  19
     10.4.  Wireless Security - Authentication Attacks . . . . . . .  20
   11. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  20
     11.1.  Encrypted DNS Flag Bits  . . . . . . . . . . . . . . . .  20
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