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Versions: 00

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
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   This Internet-Draft will expire on January 23, 2020.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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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                            ~
   +                               +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                               |            Padding            |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

3.  Examples

   dns64.example.com. IN APL !1:10.0.0/24 1:10/8 2:64:ff9b::/32

                               Single Record

   dns64.example.com. IN APL !1:10.0.0/24 1:10/8
   dns64.example.com. IN APL 2:64:ff9b::/32

                             Multiple Records

   Exclude 10.0.0.0/8 except for 10.0.0.0/24 from DNS64 processing.

   Exclude the well known DNS64 prefix 64:ff9b::/32 from DNS64
   processing.

4.  IANA Considerations

   The IANA is requested to assign a new IPv6 Neighbor Discovery Option
   type for the DNS64-EXCLUDE option defined in this document.

   +----------------------+-------+
   | Option Name          | Type  |
   +----------------------+-------+
   | DNS64-EXCLUDE option | (TBD) |
   +----------------------+-------+

   The IANA registry for these options is:

   https://www.iana.org/assignments/icmpv6-parameters [1]

5.  Security Considerations

   TBA






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6.  References

6.1.  Normative References

   [RFC1034]  Mockapetris, P., "Domain names - concepts and facilities",
              STD 13, RFC 1034, DOI 10.17487/RFC1034, November 1987,
              <https://www.rfc-editor.org/info/rfc1034>.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

   [RFC3123]  Koch, P., "A DNS RR Type for Lists of Address Prefixes
              (APL RR)", RFC 3123, DOI 10.17487/RFC3123, June 2001,
              <https://www.rfc-editor.org/info/rfc3123>.

6.2.  Informative References

   [RFC4034]  Arends, R., Austein, R., Larson, M., Massey, D., and S.
              Rose, "Resource Records for the DNS Security Extensions",
              RFC 4034, DOI 10.17487/RFC4034, March 2005,
              <https://www.rfc-editor.org/info/rfc4034>.

   [RFC6147]  Bagnulo, M., Sullivan, A., Matthews, P., and I. van
              Beijnum, "DNS64: DNS Extensions for Network Address
              Translation from IPv6 Clients to IPv4 Servers", RFC 6147,
              DOI 10.17487/RFC6147, April 2011,
              <https://www.rfc-editor.org/info/rfc6147>.

6.3.  URIs

   [1] https://www.iana.org/assignments/icmpv6-parameters

Author's Address

   M.  Andrews
   Internet Systems Consortium
   950 Charter Street
   Redwood City, CA  94063
   US

   Email: marka@isc.org








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