DNS over Transport Layer Security announcements using DHCP or Router Advertisements
draft-peterson-dot-dhcp-00

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Last updated 2019-04-27
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Network Working Group                                        T. Peterson
Internet-Draft                                            April 27, 2019
Intended status: Standards Track
Expires: October 29, 2019

  DNS over Transport Layer Security announcements using DHCP or Router
                             Advertisements
                       draft-peterson-dot-dhcp-00

Abstract

   This specification describes a DHCP option and Router Advertisement
   (RA) extension to inform clients of the presence of DNS resolvers
   with Transport Layer Security (TLS).

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
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   This Internet-Draft will expire on October 29, 2019.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions and Definitions . . . . . . . . . . . . . . . . .   2
   3.  The DNS over TLS Option . . . . . . . . . . . . . . . . . . .   2
     3.1.  IPv4 DHCP Option  . . . . . . . . . . . . . . . . . . . .   2
     3.2.  IPv6 DHCP Option  . . . . . . . . . . . . . . . . . . . .   3
     3.3.  The DoT IPv6 RA Option  . . . . . . . . . . . . . . . . .   3
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   4
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .   5
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   DHCPv4 [RFC2131], DHCPv6 [RFC3646], and IPv6 Router Announcements
   [RFC8106] all provide means to inform clients of available resolvers
   using the incumbent DNS protocol for querying, however there is no
   means of specifying alternate protocols to perform DNS queries.

2.  Conventions and Definitions

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

3.  The DNS over TLS Option

3.1.  IPv4 DHCP Option

   The format of the IPv4 DoT DHCP option is shown below.

    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |      Code     |      Len      |                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+                               |
   |                                                               |
   |                          DNS Servers                          |
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Code:  The DoT DHCPv4 option (one octet)

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   Length:  Length of the DNS Servers list in octects

   DNS Servers:  One or more IPv4 addresses of DNS servers

3.2.  IPv6 DHCP Option

   The format of the IPv6 Captive-Portal DHCP option is shown below.

    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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