RFC 7535: AS112 Redirection Using DNAME | RFC Editor

Skip to content Primary navigationThe RFC SeriesFor AuthorsAbout UsHomeRFC 7535 View as: Plain Text, Compact HTML Info RFC 7535: AS112 Redirection Using DNAMEDNSMay 2015. J. Abley, B. Dickson, W. Kumari, G. MichaelsonInformationalSubscribe15 subscribed Add to Set Added to 2 Sets Read aloud Internet Engineering Task Force (IETF) J. Abley Request for Comments: 7535 Dyn, Inc. Category: Informational B. Dickson ISSN: 2070-1721 Twitter, Inc. W. Kumari Google G. Michaelson APNIC May 2015 AS112 Redirection Using DNAME Abstract AS112 provides a mechanism for handling reverse lookups on IP addresses that are not unique (e.g., RFC 1918 addresses). This document describes modifications to the deployment and use of AS112 infrastructure that will allow zones to be added and dropped much more easily, using DNAME resource records. This approach makes it possible for any DNS zone administrator to sink traffic relating to parts of the global DNS namespace under their control to the AS112 infrastructure without coordination with the operators of AS112 infrastructure. Status of This Memo This document is not an Internet Standards Track specification; it is published for informational purposes. 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). Not all documents approved by the IESG are a candidate for any level of Internet Standard; see 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/rfc7535. Abley, et al. Informational [Page 1] RFC 7535 AS112 Redirection Using DNAME May 2015 Copyright Notice Copyright (c) 2015 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. Table of Contents 1. Introduction ....................................................3 2. Design Overview .................................................4 3. AS112 Operations ................................................5 3.1. Extensions to Support DNAME Redirection ....................5 3.2. Redirection of Query Traffic to AS112 Servers ..............5 4. Continuity of AS112 Operations ..................................6 5. Candidate Zones for AS112 Redirection ...........................6 6. DNAME Deployment Considerations .................................7 7. IAB Statement Regarding This .ARPA Request ......................8 8. IANA Considerations .............................................8 8.1. Address Assignment .........................................8 8.2. Hosting of AS112.ARPA .....................................10 8.3. Delegation of AS112.ARPA ..................................10 9. Security Considerations ........................................10 10. References ....................................................11 10.1. Normative References .....................................11 10.2. Informative References ...................................11 Appendix A. Assessing Support for DNAME in the Real World .........13 A.1. Methodology ................................................13 A.2. Results ....................................................15 Acknowledgements ..................................................16 Authors' Addresses ................................................16 Abley, et al. Informational [Page 2] RFC 7535 AS112 Redirection Using DNAME May 2015 1. Introduction Many sites connected to the Internet make use of IPv4 addresses that are not globally unique. Examples are the addresses designated in [RFC1918] for private use within individual sites. Devices in such environments may occasionally originate Domain Name System (DNS) queries (so-called "reverse lookups") corresponding to those private-use addresses. Since the addresses concerned have only local significance, it is good practice for site administrators to ensure that such queries are answered locally. However, it is not uncommon for such queries to follow the normal delegation path in the public DNS instead of being answered within the site. It is not possible for public DNS servers to give useful answers to such queries. In addition, due to the wide deployment of private-use addresses and the continuing growth of the Internet, the volume of such queries is large and growing. The AS112 project aims to provide a distributed sink for such queries in order to reduce the load on the IN-ADDR.ARPA authoritative servers. The AS112 project is named after the Autonomous System Number (ASN) that was assigned to it. Prior to implementation of this technique, the AS112 project did not accommodate the addition and removal of DNS zones elegantly. Since additional zones of definitively local significance are known to exist, this presents a problem. This document describes modifications to the deployment and use of AS112 infrastructure that will allow zones to be added and dropped much more easily. The AS112 project is described in detail in [RFC7534]. The AS112 nameservers (PRISONER.IANA.ORG, BLACKHOLE-1.IANA.ORG, and BLACKHOLE-2.IANA.ORG) are required to answer authoritatively for each and every zone that is delegated to them. If a zone is delegated to AS112 nameservers without those nameservers being configured ahead of time to answer authoritatively for that zone, there is a detrimental impac