AS112 Redirection Using DNAME
RFC 7535

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Internet Engineering Task Force (IETF)                          J. Abley
Request for Comments: 7535                                     Dyn, Inc.
Category: Informational                                       B. Dickson
ISSN: 2070-1721                                            Twitter, Inc.
                                                               W. Kumari
                                                                  Google
                                                           G. Michaelson
                                                                   APNIC
                                                                May 2015

                     AS112 Redirection Using DNAME

Abstract

   AS112 provides a mechanism for handling reverse lookups on IP
   addresses that are not unique (e.g., RFC 1918 addresses).  This
   document describes modifications to the deployment and use of AS112
   infrastructure that will allow zones to be added and dropped much
   more easily, using DNAME resource records.

   This approach makes it possible for any DNS zone administrator to
   sink traffic relating to parts of the global DNS namespace under
   their control to the AS112 infrastructure without coordination with
   the operators of AS112 infrastructure.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   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).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7535.

Abley, et al.                 Informational                     [Page 1]
RFC 7535              AS112 Redirection Using DNAME             May 2015

Copyright Notice

   Copyright (c) 2015 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
   (http://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
   2. Design Overview .................................................4
   3. AS112 Operations ................................................5
      3.1. Extensions to Support DNAME Redirection ....................5
      3.2. Redirection of Query Traffic to AS112 Servers ..............5
   4. Continuity of AS112 Operations ..................................6
   5. Candidate Zones for AS112 Redirection ...........................6
   6. DNAME Deployment Considerations .................................7
   7. IAB Statement Regarding This .ARPA Request ......................8
   8. IANA Considerations .............................................8
      8.1. Address Assignment .........................................8
      8.2. Hosting of AS112.ARPA .....................................10
      8.3. Delegation of AS112.ARPA ..................................10
   9. Security Considerations ........................................10
   10. References ....................................................11
      10.1. Normative References .....................................11
      10.2. Informative References ...................................11
   Appendix A. Assessing Support for DNAME in the Real World .........13
     A.1. Methodology ................................................13
     A.2. Results ....................................................15
   Acknowledgements ..................................................16
   Authors' Addresses ................................................16

Abley, et al.                 Informational                     [Page 2]
RFC 7535              AS112 Redirection Using DNAME             May 2015

1.  Introduction

   Many sites connected to the Internet make use of IPv4 addresses that
   are not globally unique.  Examples are the addresses designated in
   [RFC1918] for private use within individual sites.

   Devices in such environments may occasionally originate Domain Name
   System (DNS) queries (so-called "reverse lookups") corresponding to
   those private-use addresses.  Since the addresses concerned have only