Special Use Domain Name 'ipv4only.arpa'
draft-cheshire-sudn-ipv4only-dot-arpa-14

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Last updated 2018-11-03
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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: May 8, 2019                                    November 4, 2018

                Special Use Domain Name 'ipv4only.arpa'
                draft-cheshire-sudn-ipv4only-dot-arpa-14

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 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.

   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
   queries to work correctly, or implementing the special behavior and
   being accused of being noncompliant with some RFC.

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

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
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   Drafts is at http://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

Cheshire & Schinazi        Expires May 8, 2019                  [Page 1]
Internet-Draft         Special Name ipv4only.arpa          November 2018

   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 May 8, 2019.

Copyright Notice

   Copyright (c) 2018 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
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   described in the Simplified BSD License.

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 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
   queries to work correctly, or implementing the special behavior and
   being accused of being noncompliant with some RFC.

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

Cheshire & Schinazi        Expires May 8, 2019                  [Page 2]
Internet-Draft         Special Name ipv4only.arpa          November 2018

2.  Conventions and Terminology Used in this Section
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