<?xml version="1.0" encoding="UTF-8"?><?xml-stylesheet type="text/xsl" href="rfc2629.xslt" ?> <!-- generated by https://github.com/cabo/kramdown-rfc2629 version 1.3.37 --><!DOCTYPE rfcSYSTEM "rfc2629.dtd"[ <!ENTITY nbsp " "> <!ENTITY zwsp "​"> <!ENTITY nbhy "‑"> <!ENTITY wj "⁠"> ]><?rfc toc="yes"?> <?rfc tocdepth="4"?> <?rfc sortrefs="yes"?> <?rfc symrefs="yes"?><rfc xmlns:xi="http://www.w3.org/2001/XInclude" ipr="trust200902" docName="draft-iab-arpa-authoritative-servers-01" number="9120" updates="3172" obsoletes="" submissionType="IAB" category="info"updates="3172">consensus="true" xml:lang="en" tocInclude="true" tocDepth="4" sortRefs="true" symRefs="true" version="3"> <!-- xml2rfc v2v3 conversion 3.9.1 --> <front> <title abbrev="Nameservers for the .arpa Domain">Nameservers for the Address and Routing Parameter Area ("arpa") Domain</title> <seriesInfo name="RFC" value="9120"/> <author initials="K." surname="Davies" fullname="Kim Davies"> <organizationabbrev="IANA">InternetshowOnFrontPage="false">Internet Assigned Numbers Authority</organization> <address> <postal> <street>PTI/ICANN</street> <street>12025 Waterfront Drive</street> <city>Los Angeles</city> <region>CA</region> <code>90094</code> <country>United States of America</country> </postal> <email>kim.davies@iana.org</email> </address> </author> <author initials="J." surname="Arkko" fullname="Jari Arkko"> <organizationabbrev="Ericsson">EricssonshowOnFrontPage="false">Ericsson Research</organization> <address> <postal> <street>02700 Kauniainen</street> <country>Finland</country> </postal> <email>jari.arkko@ericsson.com</email> </address> </author> <date year="2021"month="July" day="12"/> <keyword>Internet-Draft</keyword>month="October"/> <keyword>root zone</keyword> <keyword>IANA</keyword> <keyword>top-level domain</keyword> <keyword>root nameservers</keyword> <keyword>DNS</keyword> <keyword>ARPA</keyword> <abstract> <t>This document describes revisions to operational practices to separate the function of the“arpa”"arpa" top-level domain in the DNS from its historical operation alongside the DNS root zone.</t> </abstract> </front> <middle> <section anchor="introduction"title="Introduction">numbered="true" toc="default"> <name>Introduction</name> <t>The“arpa”"arpa" top-level domain <xreftarget="RFC3172"/>target="RFC3172" format="default"/> is designated as an“infrastructure domain”"infrastructure domain" to support techniques defined by Internet standards. Zones under the“arpa”"arpa" domain provide various mappings, such as IP addresses to domain names and E.164 numbers to URIs. It also containsspecial usespecial-use names such as“home”,"home", which is anon-uniquenonunique name used in residential networks.</t> <t>Historically, the“arpa”"arpa" zone has been hosted on almost all of the rootnameservers,nameservers (NSs), and <xreftarget="RFC3172"/>target="RFC3172" format="default"/> envisages the“arpa”"arpa" domain to be“sufficiently"sufficiently critical that the operational requirements for the rootnameserversservers apply to the operational requirements of the“arpa” servers”."arpa" servers". To date, this has been implemented by serving the“arpa”"arpa" domain directly on a subset of the root server infrastructure.</t> <t>This bundling of root nameserver and“arpa”"arpa" nameserver operations has entwined management of thezones’zones' contents and theirinfrastructure.infrastructures. As a result, some proposals under consideration by the IETF involving the“arpa”"arpa" zone have been discarded due to the risk of conflict with operations associated with managing the content of the rootzone,zone or administering the root nameservers.</t> <t>The separation described in this document resolves the operational impacts of synchronizing edits to the root zone and the“arpa”"arpa" zone by eliminating the current dependency and allowing more tailored operations based on the unique requirements of each zone.</t> </section> <section anchor="requirements-for-the-arpa-zone"title="Requirementsnumbered="true" toc="default"> <name>Requirements for the“arpa” zone">"arpa" Zone</name> <t>The“arpa”"arpa" domain continues to play a role in critical Internet operations, and this change does not propose weakening operational requirements described in <xreftarget="RFC3172"/>target="RFC3172" format="default"/> for the domain. Future operational requirements for the“arpa”"arpa" domain are encouraged to follow strong baseline requirements such as those documented in <xreftarget="RFC7720"/>.</t>target="RFC7720" format="default"/>.</t> <t>Changes to the administration of the“arpa”"arpa" zone do not alter the management practices of other zones delegated within the“arpa”"arpa" namespace. For example,“ip6.arpa”"ip6.arpa" would continue to be managed in accordance with <xreftarget="RFC5855"/>.</t>target="RFC5855" format="default"/>.</t> </section> <section anchor="transition-process"title="Transition Process">numbered="true" toc="default"> <name>Transition Process</name> <t>The process will dedicate new hostnames to the servers that are authoritative for the“arpa”"arpa" zone, but it will initially serve the“arpa”"arpa" zone from the same hosts.</t> <t>Once completed, subsequent transitional phases could include using new hosts to replace or augment the existing root nameserverhosts,hosts andseparation ofseparating the editing and distribution of the“arpa”"arpa" zone from necessarily being connected to the root zone. Any future management considerations regarding how such changes may be performed are beyond the scope of this document.</t> <section anchor="dedicated-nameserver-hostnames"title="Dedicated nameserver hostnames">numbered="true" toc="default"> <name>Dedicated Nameserver Hostnames</name> <t>Consistent with the use of the“arpa”"arpa" namespace itself to hostname serversnameservers for other delegations in the“arpa”"arpa" zone(<xref target="RFC5855"/>),<xref target="RFC5855" format="default"/>, this document specifies a new namespace of“ns.arpa”,"ns.arpa", with the nameserver set for the“arpa”"arpa" zone to be initiallylabelledlabeled as follows:</t><figure><artwork><![CDATA[<artwork name="" type="" align="left" alt=""><![CDATA[ a.ns.arpa b.ns.arpa c.ns.arpa ...]]></artwork></figure>]]></artwork> <t>Dedicated hostnames eliminate a logical dependency that requires the coordinated editing of the nameservers for the“arpa”"arpa" zone and the root zone. This component of this transition does not require that the underlying hosts that provide“arpa”"arpa" name service (that is, the root nameservers) be altered. The“arpa”"arpa" zone will initially map the new hostnames to the same IP addresses that already provide service under the respective hostnames withinroot-servers.net.</t>"root-servers.net".</t> <t>Because these nameservers are completely within the“arpa”"arpa" zone, they will require glue records in the root zone. This is consistent with current practice and requires no operational changes to the root zone.</t> </section> <section anchor="separation-of-infrastructure"title="Separationnumbered="true" toc="default"> <name>Separation ofinfrastructure">Infrastructure</name> <t>After initially migrating the“arpa”"arpa" zone to use hostnames that are not shared with the root zone, the underlying name service is expected to evolve such that it no longer directly alignstowith a subset of root nameserver instances. With no shared infrastructure between the root nameservers and the“arpa”"arpa" nameservers, future novel applications for the“arpa”"arpa" zone may be possible.</t> <t>Any subsequentchangeschange to the parties providing name service for the zone is considered a normal managementresponsibility,responsibility and would be performed in accordance with <xreftarget="RFC3172"/>.</t>target="RFC3172" format="default"/>.</t> </section> <section anchor="zone-administration"title="Zone administration">numbered="true" toc="default"> <name>Zone Administration</name> <t>Publication of the“arpa”"arpa" zone file to the authoritative“arpa” name servers"arpa" nameservers is currently undertaken alongside the root zone maintenance functions. Upon the separation of the“arpa”"arpa" infrastructure from the root nameserver infrastructure, publication of the“arpa”"arpa" zone no longer necessarily needs to be technically linked orinter-relatedinterrelated to the root zone publication mechanisms.</t> </section> <section anchor="conclusion-of-process"title="Conclusionnumbered="true" toc="default"> <name>Conclusion ofprocess">Process</name> <t>Full technical separation of operations of the“arpa”"arpa" zone and root zone minimally requires the following to be satisfied:</t><t><list style="symbols"> <t>The “arpa”<ul spacing="normal"> <li>The "arpa" zone no longer shares any hostnames in itsNS-setnameserver set with the rootzone;</t> <t>Thezone.</li> <li>The hosts that provide authoritative name service are not the same hosts as the root nameservers, do not share any IPv4 or IPv6 addresses with the root servers, and are sufficientlyseparatelyprovisioned separately such that any unique“arpa”"arpa" zone requirements can be deployed without affecting how root zone service isprovided;</t> <t>Theprovided.</li> <li>The editorial and publication process for the“arpa”"arpa" zonehasremoves any common dependencies with the root zone processremoved,so that the“arpa”"arpa" zone can be managed,editededited, and provisioned wholly independently of the rootzone.</t> </list></t>zone.</li> </ul> <t>Such separation is ultimately sought to allow for novel uses of the“arpa”"arpa" zone without the risk ofinadvertantlyinadvertently impacting root zone and root server operations. It is recognized that achieving this state requires a deliberative process involving significant coordination to ensure impacts are minimized.</t> </section> </section> <section anchor="iana-considerations"title="IANA Considerations"> <t>The IANAnumbered="true" toc="default"> <name>IANA Considerations</name> <t>IANA shall coordinate the creation of the“ns.arpa”"ns.arpa" namespace and populate it with address records that reflect the IP addresses of the contemporary root servers documented within“root-servers.net”"root-servers.net" as its initial state. The namespace mayeitherbe provisioned either directly within the“arpa”"arpa" zone (as an emptynon-terminal),nonterminal) or through establishing a dedicated“ns.arpa”"ns.arpa" zone, according to operational requirements.</t><t>The IANA<t>IANA will initially migrate the 12 NS records for the“arpa”"arpa" zone to point to their respective new entries in the“ns.arpa”"ns.arpa" domain.</t><t>Subsequently,<t>When these actions are complete, the IAB and IANA will consult and coordinate with all relevant parties on activity to reduce or eliminate reliance upon the root zone and root server infrastructureforserving the“arpa”"arpa" zone. Such changes will be performed in compliance with <xreftarget="RFC3172"/>target="RFC3172" format="default"/> and shall be conducted with all due care and deliberation to mitigate potential impacts on critical infrastructure.</t> </section> <section anchor="security-considerations"title="Security Considerations">numbered="true" toc="default"> <name>Security Considerations</name> <t>The security of the“arpa”"arpa" zone is not necessarily impacted by any aspects of these changes. Robust practices associated with administering the content of the zone (including signing the zone with DNSSEC) as well as its distribution will continue to be necessary.</t> </section> </middle> <back><references title='Normative References'> <reference anchor='RFC3172' target='https://www.rfc-editor.org/info/rfc3172'> <front> <title>Management Guidelines & Operational Requirements for the Address and Routing Parameter Area Domain ("arpa")</title> <author fullname='G. Huston' initials='G.' role='editor' surname='Huston'><organization/></author> <date month='September' year='2001'/> <abstract><t>This memo describes the management and operational requirements for the address and routing parameter area ("arpa") domain. This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements.</t></abstract> </front> <seriesInfo name='BCP' value='52'/> <seriesInfo name='RFC' value='3172'/> <seriesInfo name='DOI' value='10.17487/RFC3172'/> </reference><references> <name>References</name> <references> <name>Normative References</name> <xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.3172.xml"/> </references><references title='Informative References'> <reference anchor='RFC5855' target='https://www.rfc-editor.org/info/rfc5855'> <front> <title>Nameservers for IPv4 and IPv6 Reverse Zones</title> <author fullname='J. Abley' initials='J.' surname='Abley'><organization/></author> <author fullname='T. Manderson' initials='T.' surname='Manderson'><organization/></author> <date month='May' year='2010'/> <abstract><t>This document specifies a stable naming scheme for the nameservers that serve the zones IN-ADDR.ARPA and IP6.ARPA in the DNS. These zones contain data that facilitate reverse mapping (address to name). This memo documents an Internet Best Current Practice.</t></abstract> </front> <seriesInfo name='BCP' value='155'/> <seriesInfo name='RFC' value='5855'/> <seriesInfo name='DOI' value='10.17487/RFC5855'/> </reference> <reference anchor='RFC7720' target='https://www.rfc-editor.org/info/rfc7720'> <front> <title>DNS Root Name Service Protocol and Deployment Requirements</title> <author fullname='M. Blanchet' initials='M.' surname='Blanchet'><organization/></author> <author fullname='L-J. Liman' initials='L-J.' surname='Liman'><organization/></author> <date month='December' year='2015'/> <abstract><t>The DNS root name service is a critical part of the Internet architecture. The protocol and deployment requirements for<references> <name>Informative References</name> <xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.5855.xml"/> <xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.7720.xml"/> </references> </references> <section numbered="false" anchor="members" toc="default"> <name>IAB Members at the Time of Approval</name> <t>Internet Architecture Board members at theDNS root name service are defined intime thisdocument. Operational requirements are out of scope.</t></abstract> </front> <seriesInfo name='BCP' value='40'/> <seriesInfo name='RFC' value='7720'/> <seriesInfo name='DOI' value='10.17487/RFC7720'/> </reference> </references>document was approved for publication were:</t> <ul empty="true" indent="3" spacing="compact"> <li><t><contact fullname="Jari Arkko"/></t></li> <li><t><contact fullname="Deborah Brungard"/></t></li> <li><t><contact fullname="Ben Campbell"/></t></li> <li><t><contact fullname="Lars Eggert"/></t></li> <li><t><contact fullname="Wes Hardaker"/></t></li> <li><t><contact fullname="Cullen Jennings"/></t></li> <li><t><contact fullname="Mirja Kühlewind"/></t></li> <li><t><contact fullname="Zhenbin Li"/></t></li> <li><t><contact fullname="Jared Mauch"/></t></li> <li><t><contact fullname="Tommy Pauly"/></t></li> <li><t><contact fullname="David Schinazi"/></t></li> <li><t><contact fullname="Russ White"/></t></li> <li><t><contact fullname="Jiankang Yao"/></t></li> </ul> </section> <section numbered="false" anchor="acknowledgments"title="Acknowledgments">toc="default"> <name>Acknowledgments</name> <t>Thank youAlyssa Cooper, Michelle Cotton, Lars-Johan Liman, Wes Hardaker, Ted Hardie, Paul Hoffman, Russ Housley, Oscar Robles-Garay, Duane Wessels and Suzanne Woolf<contact fullname="Alissa Cooper"/>, <contact fullname="Michelle Cotton"/>, <contact fullname="Lars-Johan Liman"/>, <contact fullname="Wes Hardaker"/>, <contact fullname="Ted Hardie"/>, <contact fullname="Paul Hoffman"/>, <contact fullname="Russ Housley"/>, <contact fullname="Oscar Robles-Garay"/>, <contact fullname="Duane Wessels"/>, and <contact fullname="Suzanne Woolf"/> for providing review and feedback.</t> </section> </back><!-- ##markdown-source: H4sIAGJy7GAAA31ZXW8bNxZ9568glIdNFpLW8SbNVosF6sZJ47brGnGKAH1Z UDOUxPWInJIcO0qR/e177iVnhiMrLVDEGnHI+3HOuZdXi8VCRBMbvZLXaq+D 9vfaB7lxXsadlhd17XUIUtlavnddNHYrb5THyqi9vPBayacz5Vs1eyYv3V4Z K9R67fX96e2WtLRfWLvKYs1K1l5t4sKo9YK+Xqgu7pw3UUVzrxd5i8XZcyFC 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