RFC7793

Internet Engineering Task Force (IETF) M. Andrews Request for Comments: 7793 ISC BCP: 163 May 2016 Category: Best Current Practice ISSN: 2070-1721

              Adding 100.64.0.0/10 Prefixes to the
             IPv4 Locally-Served DNS Zones Registry

Abstract

RFC 6598 specifies that "Reverse DNS queries for Shared Address Space addresses [100.64.0.0/10] MUST NOT be forwarded to the global DNS infrastructure."

This document formally directs IANA to add the associated zones to the "IPv4 Locally-Served DNS Zones Registry" to prevent such queries from accidentally leaking to the global DNS infrastructure.

Status of This Memo

This memo documents an Internet Best Current Practice.

This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on BCPs is available in Section 2 of RFC 5741.

Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at http://www.rfc-editor.org/info/rfc7793.

Copyright Notice

Copyright (c) 2016 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 Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must 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.

Introduction

RFC6598 specifies that "Reverse DNS queries for Shared Address Space addresses [100.64.0.0/10] MUST NOT be forwarded to the global DNS infrastructure." RFC6303 provides guidance on handling such queries.

This document directs the IANA to add the IPv4 reverse zones corresponding to 100.64.0.0/10, a netblock reserved in RFC6598, to the "IPv4 Locally-Served DNS Zone Registry" established in RFC6303.

Unlike the addresses described in RFC1918, which are not expected to be seen by other parties, the addresses defined by RFC6598 are expected to be seen by parties other than those deploying the addresses. Therefore, it is more crucial that recursive nameservers default to serving these zones locally.

Changes to the IPv4 Locally-Served DNS Zones Registry

IANA has added the zones listed in "RFC 6598 Zones" (Section 2.1) to the "IPv4 Locally-Served DNS Zone Registry".

RFC 6598 Zones

  64.100.IN-ADDR.ARPA

  65.100.IN-ADDR.ARPA

  66.100.IN-ADDR.ARPA

  67.100.IN-ADDR.ARPA

  68.100.IN-ADDR.ARPA

  69.100.IN-ADDR.ARPA

  70.100.IN-ADDR.ARPA

  71.100.IN-ADDR.ARPA

  72.100.IN-ADDR.ARPA

  73.100.IN-ADDR.ARPA

  74.100.IN-ADDR.ARPA

  75.100.IN-ADDR.ARPA

  76.100.IN-ADDR.ARPA

  77.100.IN-ADDR.ARPA

  78.100.IN-ADDR.ARPA

  79.100.IN-ADDR.ARPA

  80.100.IN-ADDR.ARPA

  81.100.IN-ADDR.ARPA

  82.100.IN-ADDR.ARPA

  83.100.IN-ADDR.ARPA

  84.100.IN-ADDR.ARPA

  85.100.IN-ADDR.ARPA

  86.100.IN-ADDR.ARPA

  87.100.IN-ADDR.ARPA

  88.100.IN-ADDR.ARPA

  89.100.IN-ADDR.ARPA

  90.100.IN-ADDR.ARPA

  91.100.IN-ADDR.ARPA

  92.100.IN-ADDR.ARPA

  93.100.IN-ADDR.ARPA

  94.100.IN-ADDR.ARPA

  95.100.IN-ADDR.ARPA

  96.100.IN-ADDR.ARPA

  97.100.IN-ADDR.ARPA

  98.100.IN-ADDR.ARPA

  99.100.IN-ADDR.ARPA

  100.100.IN-ADDR.ARPA

  101.100.IN-ADDR.ARPA

  102.100.IN-ADDR.ARPA

  103.100.IN-ADDR.ARPA

  104.100.IN-ADDR.ARPA

  105.100.IN-ADDR.ARPA

  106.100.IN-ADDR.ARPA

  107.100.IN-ADDR.ARPA

  108.100.IN-ADDR.ARPA

  109.100.IN-ADDR.ARPA

  110.100.IN-ADDR.ARPA

  111.100.IN-ADDR.ARPA

  112.100.IN-ADDR.ARPA

  113.100.IN-ADDR.ARPA

  114.100.IN-ADDR.ARPA

  115.100.IN-ADDR.ARPA

  116.100.IN-ADDR.ARPA

  117.100.IN-ADDR.ARPA

  118.100.IN-ADDR.ARPA

  119.100.IN-ADDR.ARPA

  120.100.IN-ADDR.ARPA

  121.100.IN-ADDR.ARPA

  122.100.IN-ADDR.ARPA

  123.100.IN-ADDR.ARPA

  124.100.IN-ADDR.ARPA

  125.100.IN-ADDR.ARPA

  126.100.IN-ADDR.ARPA

  127.100.IN-ADDR.ARPA

IANA Considerations

Per this document, IANA has added the zones listed in "RFC 6598 Zones" (Section 2.1) to the "IPv4 Locally-Served DNS Zone Registry".

IANA is reminded that an insecure delegation for these zones is required for compliance with RFC6303 to break the DNSSEC chain of trust.

Security Considerations

This document does not present additional security risks to the Internet than those described in RFC6303 and RFC6598.

Normative References

RFC1918 Rekhter, Y., Moskowitz, B., Karrenberg, D., de Groot, G.,

          and E. Lear, "Address Allocation for Private Internets",
          BCP 5, RFC 1918, DOI 10.17487/RFC1918, February 1996,
          <http://www.rfc-editor.org/info/rfc1918>.

RFC6303 Andrews, M., "Locally Served DNS Zones", BCP 163,

          RFC 6303, DOI 10.17487/RFC6303, July 2011,
          <http://www.rfc-editor.org/info/rfc6303>.

RFC6598 Weil, J., Kuarsingh, V., Donley, C., Liljenstolpe, C., and

          M. Azinger, "IANA-Reserved IPv4 Prefix for Shared Address
          Space", BCP 153, RFC 6598, DOI 10.17487/RFC6598, April
          2012, <http://www.rfc-editor.org/info/rfc6598>.

Acknowledgements

The author would like to thank Joe Abley for his review comments.

Author's Address

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

Email: [email protected]