Providing Minimal-Sized Responses to DNS Queries That Have QTYPE=ANY
RFC 8482

• Status
• IESG evaluation record
• IESG writeups
• Email expansions
• History

• Versions
• 00
• 01
• 02
• 03
• 04
• 05
• 06
• 07

Internet Engineering Task Force (IETF)                          J. Abley
Request for Comments: 8482                                       Afilias
Updates: 1034, 1035                                       O. Gudmundsson
Category: Standards Track                                   M. Majkowski
ISSN: 2070-1721                                          Cloudflare Inc.
                                                                 E. Hunt
                                                                     ISC
                                                            January 2019

  Providing Minimal-Sized Responses to DNS Queries That Have QTYPE=ANY

Abstract

   The Domain Name System (DNS) specifies a query type (QTYPE) "ANY".
   The operator of an authoritative DNS server might choose not to
   respond to such queries for reasons of local policy, motivated by
   security, performance, or other reasons.

   The DNS specification does not include specific guidance for the
   behavior of DNS servers or clients in this situation.  This document
   aims to provide such guidance.

   This document updates RFCs 1034 and 1035.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8482.

Abley, et al.                Standards Track                    [Page 1]
RFC 8482            Minimal Responses for ANY Queries       January 2019

Copyright Notice

   Copyright (c) 2019 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.

Table of Contents

   1. Introduction ....................................................3
      1.1. Terminology ................................................3
   2. Motivations for Use of ANY Queries ..............................3
   3. General Approach ................................................4
   4. Behavior of DNS Responders ......................................5
      4.1. Answer with a Subset of Available RRsets ...................5
      4.2. Answer with a Synthesized HINFO RRset ......................5
      4.3. Answer with Best Guess as to Intention .....................6
      4.4. Transport Considerations ...................................6
   5. Behavior of DNS Initiators ......................................7
   6. HINFO Considerations ............................................7
   7. Updates to RFCs 1034 and 1035 ...................................7
   8. Implementation Experience .......................................8
   9. Security Considerations .........................................8
   10. IANA Considerations ............................................9
   11. References .....................................................9
      11.1. Normative References ......................................9
      11.2. Informative References ....................................9
   Acknowledgements ..................................................10
   Authors' Addresses ................................................10

Abley, et al.                Standards Track                    [Page 2]
RFC 8482            Minimal Responses for ANY Queries       January 2019

1.  Introduction

   The Domain Name System (DNS) specifies a query type (QTYPE) "ANY".
   The operator of an authoritative DNS server might choose not to
   respond to such queries for reasons of local policy, motivated by
   security, performance, or other reasons.

   The DNS specification [RFC1034] [RFC1035] does not include specific
   guidance for the behavior of DNS servers or clients in this
   situation.  This document aims to provide such guidance.

1.1.  Terminology

   This document uses terminology specific to the Domain Name System
   (DNS), descriptions of which can be found in [RFC8499].

   [RFC1035] defined type 255 to be "*".  However, DNS implementations
   commonly use the keyword "ANY" to refer to that type code; this
   document follows that common usage.