Special Use Domain Name 'ipv4only.arpa'
draft-cheshire-sudn-ipv4only-dot-arpa-17

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Last updated 2020-03-26 (latest revision 2020-03-19)
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Network Working Group                                        S. Cheshire
Internet-Draft                                                Apple Inc.
Updates: 7050 (if approved)                                  D. Schinazi
Intended status: Standards Track                              Google LLC
Expires: September 20, 2020                               March 19, 2020

                Special Use Domain Name 'ipv4only.arpa'
                draft-cheshire-sudn-ipv4only-dot-arpa-17

Abstract

   The specification for how a client discovers its local network's
   NAT64 prefix (RFC7050) defines the special name 'ipv4only.arpa' for
   this purpose, but in its Domain Name Reservation Considerations
   section that specification indicates that the name actually has no
   particularly special properties that would require special handling,
   and does not request IANA to record the name in the Special-Use
   Domain Names registry.

   Consequently, despite the well articulated special purpose of the
   name, 'ipv4only.arpa' was not recorded in the Special-Use Domain
   Names registry as a name with special properties.

   This document describes the special treatment required, formally
   declares the special properties of the name, adds similar
   declarations for the corresponding reverse mapping names, and updates
   RFC7050.

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 September 20, 2020.

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Copyright Notice

   Copyright (c) 2020 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
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   publication of this document.  Please review these documents
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Specialness of 'ipv4only.arpa'  . . . . . . . . . . . . . . .   3
   3.  Consequences of 'ipv4only.arpa' not being declared special  .   4
   4.  Remedies  . . . . . . . . . . . . . . . . . . . . . . . . . .   6
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   7.  Domain Name Reservation Considerations  . . . . . . . . . . .  10
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  17
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  17
   Appendix A.  Example BIND 9 Configuration . . . . . . . . . . . .  19
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  20

Cheshire & Schinazi    Expires September 20, 2020               [Page 2]
Internet-Draft         Special Name ipv4only.arpa             March 2020

1.  Introduction

   The specification for how a client discovers its local network's
   NAT64 prefix [RFC7050] defines the special name 'ipv4only.arpa' for
   this purpose, but in its Domain Name Reservation Considerations
   section that specification indicates that the name actually has no
   particularly special properties that would require special handling,
   and does not request IANA to record the name in the Special-Use
   Domain Names registry [SUDN].

   Consequently, despite the well articulated special purpose of the
   name, 'ipv4only.arpa' was not recorded in the Special-Use Domain
   Names registry [SUDN] as a name with special properties.

   This omission was discussed in the Special-Use Domain Names Problem
   Statement [RFC8244].

   As a result of this omission, in cases where software needs to give
   this name special treatment in order for it to work correctly, there
   was no clear mandate authorizing software authors to implement that
   special treatment.  Software implementers were left with the choice
   between not implementing the special behavior necessary for the name
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