DNS Resolver Information
draft-reddy-add-resolver-info-02

Document Type Active Internet-Draft (individual)
Authors Tirumaleswar Reddy.K  , Mohamed Boucadair 
Last updated 2021-04-05
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ADD WG                                                          T. Reddy
Internet-Draft                                                    McAfee
Intended status: Standards Track                            M. Boucadair
Expires: October 7, 2021                                          Orange
                                                           April 5, 2021

                        DNS Resolver Information
                    draft-reddy-add-resolver-info-02

Abstract

   This document specifies a method for DNS resolvers to publish
   information about themselves.  Clients can use the resolver
   information to identify the capabilities of DNS resolvers.

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 October 7, 2021.

Copyright Notice

   Copyright (c) 2021 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
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Retrieving Resolver Information . . . . . . . . . . . . . . .   3
   4.  Format of the Resolver Information  . . . . . . . . . . . . .   3
   5.  Resolver Information  . . . . . . . . . . . . . . . . . . . .   4
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
     7.1.  RESINFO RRtype  . . . . . . . . . . . . . . . . . . . . .   5
     7.2.  DNS Resolver Information Registration . . . . . . . . . .   5
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   7
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   Historically, DNS stub resolvers communicated with recursive
   resolvers without needing to know anything about the features
   supported by these recursive resolvers.  As more and more recursive
   resolvers expose different features that may impact the delivered DNS
   service, means to help stub resolvers to identify the capabilities of
   the resolver are valuable.  Typically, stub resolvers can discover
   and authenticate encrypted DNS servers provided by a local network,
   for example, using the techniques specified in [I-D.ietf-add-dnr] and
   [I-D.ietf-add-ddr].  However, these stub resolvers need a means to
   retrieve information from the discovered recursive resolvers about
   their capabilities.

   This document fills that void by specifying a method for stub
   resolvers to retrieve such information.  To that aim, a new RRtype is
   defined for stub resolvers to query the recursive resolvers.  The
   information that a resolver might want to give is defined in
   Section 5.

   Retrieved information can be used to feed the server selection
   procedure.

2.  Terminology

   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.

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   This document makes use of the terms defined in [RFC8499].

   'Encrypted DNS' refers to a DNS protocol that provides an encrypted
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