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