Special Use Domain Name 'ipv4only.arpa'
draft-cheshire-sudn-ipv4only-dot-arpa-08

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Last updated 2017-10-30
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Network Working Group                                        S. Cheshire
Internet-Draft                                               D. Schinazi
Updates: 7050 (if approved)                                   Apple Inc.
Intended status: Standards Track                        October 30, 2017
Expires: May 3, 2018

                Special Use Domain Name 'ipv4only.arpa'
                draft-cheshire-sudn-ipv4only-dot-arpa-08

Abstract

   The specification for how a client discovers its network's NAT64
   prefix [RFC7050] defines the special name 'ipv4only.arpa' for this
   purpose, but declares it to be a non-special name in that
   specification's Domain Name Reservation Considerations section.

   Consequently, despite the well articulated special purpose of the
   name, (at the time of writing) 'ipv4only.arpa' still does not appear
   as one of the names with special properties recorded in the Special-
   Use Domain Names registry.

   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
   is no clear mandate authorizing software authors to implement that
   special treatment.  Software implementers are 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 formally declares the actual 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.

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Cheshire & Schinazi        Expires May 3, 2018                  [Page 1]
Internet-Draft         Special Name ipv4only.arpa           October 2017

   This Internet-Draft will expire on May 3, 2018.

Copyright Notice

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1.  Introduction

   The specification for how a client discovers its network's NAT64
   prefix [RFC7050] defines the special name 'ipv4only.arpa' for this
   purpose, but declares it to be a non-special name in that
   specification's Domain Name Reservation Considerations section.

   Consequently, despite the well articulated special purpose of the
   name, (at the time of writing) 'ipv4only.arpa' still does not appear
   as one of the names with special properties recorded in the Special-
   Use Domain Names registry [SUDN].

   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
   is no clear mandate authorizing software authors to implement that
   special treatment.  Software implementers are 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 formally declares the actual special properties of the
   name, and adds similar declarations for the corresponding reverse
   mapping names.

Cheshire & Schinazi        Expires May 3, 2018                  [Page 2]
Internet-Draft         Special Name ipv4only.arpa           October 2017

2.  Specialness of 'ipv4only.arpa'

   The hostname 'ipv4only.arpa' is peculiar in that it was never
   intended to be treated like a normal hostname.

   A typical client never looks up the IPv4 address records for
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