Running a Root Server Local to a Resolver
draft-ietf-dnsop-7706bis-07

Document Type Active Internet-Draft (dnsop WG)
Last updated 2020-01-12
Replaces draft-kh-dnsop-7706bis
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Network Working Group                                          W. Kumari
Internet-Draft                                                    Google
Updates: 7706 (if approved)                                   P. Hoffman
Intended status: Informational                                     ICANN
Expires: July 15, 2020                                  January 12, 2020

               Running a Root Server Local to a Resolver
                      draft-ietf-dnsop-7706bis-07

Abstract

   Some DNS recursive resolvers have longer-than-desired round-trip
   times to the closest DNS root server such as during a network attack.
   Some DNS recursive resolver operators want to prevent snooping by
   third parties of requests sent to DNS root servers.  Such resolvers
   can greatly decrease the round-trip time and prevent observation of
   requests by serving a copy of the full root zone on the same server,
   such as on a loopback address or in the resolver software.  This
   document shows how to start and maintain such a copy of the root zone
   that does not cause problems for other users of the DNS, at the cost
   of adding some operational fragility for the operator.

   [ This document is being collaborated on in Github at:
   https://github.com/wkumari/draft-kh-dnsop-7706bis.  The most recent
   version of the document, open issues, and so on should all be
   available there.  The authors gratefully accept pull requests. ]

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 July 15, 2020.

Kumari & Hoffman          Expires July 15, 2020                 [Page 1]
Internet-Draft              Root Server Local               January 2020

Copyright Notice

   Copyright (c) 2020 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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Updates from RFC 7706 . . . . . . . . . . . . . . . . . .   4
     1.2.  Requirements Notation . . . . . . . . . . . . . . . . . .   4
   2.  Requirements  . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Operation of the Root Zone on the Local Server  . . . . . . .   5
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Appendix A.  Current Sources of the Root Zone . . . . . . . . . .   7
     A.1.  Root Zone Services  . . . . . . . . . . . . . . . . . . .   8
   Appendix B.  Example Configurations of Common Implementations . .   8
     B.1.  Example Configuration: BIND 9.12  . . . . . . . . . . . .   9
     B.2.  Example Configuration: Unbound 1.8  . . . . . . . . . . .  10
     B.3.  Example Configuration: BIND 9.14  . . . . . . . . . . . .  11
     B.4.  Example Configuration: Unbound 1.9  . . . . . . . . . . .  11
     B.5.  Example Configuration: Knot Resolver  . . . . . . . . . .  12
     B.6.  Example Configuration: Microsoft Windows Server 2012  . .  12
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  13

1.  Introduction

   DNS recursive resolvers have to provide answers to all queries from
   their customers, even those for domain names that do not exist.  For
   each queried name that is within a top-level domain (TLD) that is not
   in the recursive resolver's cache, the resolver must send a query to
   a root server to get the information for that TLD, or to find out
   that the TLD does not exist.  Research shows that the vast majority
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