DNS64 Exclusion List RA Option
draft-andrews-6man-dns64-exclude-00

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Network Working Group                                         M. Andrews
Internet-Draft                                                       ISC
Intended status: Standards Track                           July 22, 2019
Expires: January 23, 2020

                     DNS64 Exclusion List RA Option
                  draft-andrews-6man-dns64-exclude-00

Abstract

   To allow automatic device configuration to a DNS64 process behind a
   IPv6-only link it is necessary to provide AAAA and A record exclusion
   lists.  This document provide such a mechanism.

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 January 23, 2020.

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   Copyright (c) 2019 IETF Trust and the persons identified as the
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Reserved Words  . . . . . . . . . . . . . . . . . . . . .   2
   2.  DNS64-EXCLUDE Option  . . . . . . . . . . . . . . . . . . . .   2
   3.  Examples  . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   4
     6.3.  URIs  . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   4

1.  Introduction

   To allow automatic device configuration to a DNS64 process behind a
   IPv6-only link it is necessary to provide AAAA and A record exclusion
   lists.  This document provide such a mechanism.

   When an DNS64 implementation needs to be configured behind DNS64
   server, for example when performing DNSSEC [RFC4034] validation, the
   AAAA exclusion list from [RFC6147] needs to be made available.  When
   the DNS64 implementation implementation is also on a local dual-stack
   network the local A records also need to be excluded from DNS64
   processing to prevent local traffic being sent to the NAT64.

1.1.  Reserved Words

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

2.  DNS64-EXCLUDE Option

   The DNS64-EXLUDE option (TBA) contains a DNS wire encoded name
   [RFC1034] which points at 1 or 2 APL records [RFC3123] where the
   records contain IPv4 and IPv6 exclusions lists which are encoded on a
   first match basis.  If there are multiple records prefixes for a
   address family MUST NOT be split across multiple records as DNS
   records are not ordered.

   The IPv6 prefixes are used to populate the AAAA exclusion list from
   [RFC6147] Section 5.1.4.

   The IPv4 prefixes are used to exclude A records from translation to
   DNS64 mapped AAAA records.

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    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |     Type      |    Length     |           Lifetime            |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~              DNS Wire Encoded Name                            ~
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