Special Use Domain Name 'ipv4only.arpa'
draft-cheshire-sudn-ipv4only-dot-arpa-00

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Network Working Group                                        S. Cheshire
Internet-Draft                                               D. Schinazi
Updates: 7050 (if approved)                                   Apple Inc.
Intended status: Standards Track                        January 28, 2016
Expires: July 31, 2016

                Special Use Domain Name 'ipv4only.arpa'
                draft-cheshire-sudn-ipv4only-dot-arpa-00

Abstract

   The document "Discovery of the IPv6 Prefix Used for IPv6 Address
   Synthesis" [RFC7050] specifies the Special Use Domain Name
   'ipv4only.arpa', with certain precise special properties, but
   neglected to include a Domain Name Reservation Considerations section
   [RFC6761] formalizing those special properties.  This document
   updates RFC 7050 and formally specifies the Special Use Domain Name
   rules for ipv4only.arpa.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on July 31, 2016.

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   document authors.  All rights reserved.

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   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.

1.  Introduction

   The document "Discovery of the IPv6 Prefix Used for IPv6 Address
   Synthesis" [RFC7050] specifies the Special Use Domain Name
   'ipv4only.arpa', with certain precise special properties, but
   neglected to include a Domain Name Reservation Considerations section
   [RFC6761] formally stating those special properties.

   As a result of the name 'ipv4only.arpa' not being formally declared
   to have special properties, there was no mandate for software to
   treat this name specially.  Queries for this name are handled
   normally, and result in queries to the 'arpa' name servers.  At
   times, for reasons that are as yet unclear, the 'arpa' name servers
   have been observed to be slow or unresponsive.  The failures of these
   'ipv4only.arpa' queries result in failures of software that depends
   on them for NAT64 address synthesis.  Also, having millions of
   devices around the world depend on these answers generates pointless
   additional load on the 'arpa' name servers, which is completely
   unnecessary when this name is defined, by Internet Standard, to have
   only two address records, 192.0.0.170 and 192.0.0.171, and no other
   records.

   To remedy this situation, this document updates RFC 7050 and
   specifies the formal Special Use Domain Name rules for ipv4only.arpa.

2.  Conventions and Terminology Used in this Document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in
   "Key words for use in RFCs to Indicate Requirement Levels" [RFC2119].

3.  Security Considerations

   Hard-coding the answers for ipv4only.arpa queries avoids the risk of
   malicious devices intercepting those queries and returning incorrect
   answers.

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4.  IANA Considerations

   [Once published, this should say] IANA has recorded the name
   'ipv4only.arpa' in the Special-Use Domain Names registry [SUDN].

4.1.  Domain Name Reservation Considerations

   The name 'ipv4only.arpa' is special [RFC6761] in the following ways:

   1.  Users should never have reason to encounter the ipv4only.arpa
       domain nanme.  If they do, queries for ipv4only.arpa should
       result in the answers specified in RFC 7050.  Users have no need
       to know that ipv4only.arpa is special.

   2.  Application software may explicitly use the name ipv4only.arpa
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