Internet Engineering Task Force (IETF)
Request for Comments: 7720
BCP: 40
Obsoletes: 2870
Category: Best Current Practice
ISSN: 2070-1721

M. Blanchet
Viagenie
L-J. Liman
Netnod
December 2015

DNS Root Name Service Protocol and Deployment Requirements

Abstract

The DNS root name service is a critical part of the Internet architecture. The protocol and deployment requirements for the DNS root name service are defined in this document. Operational requirements are out of scope.

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/rfc7720.

Copyright Notice

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.

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Relationship to RFC 2870  . . . . . . . . . . . . . . . .   2
   2.  Protocol Requirements . . . . . . . . . . . . . . . . . . . .   3
   3.  Deployment Requirements . . . . . . . . . . . . . . . . . . .   3
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   5.  Informative References  . . . . . . . . . . . . . . . . . . .   4
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1. Introduction

[RFC2870] discusses protocol and operational requirements for root name servers for the Internet's domain name system (DNS) protocol [RFC1035]. Since its publication, both protocol and operational requirements have evolved. It makes more sense now to separate the two sets of requirements into two separate documents. This document only defines the protocol requirements and some deployment requirements. The operational requirements that were defined in RFC 2870 have been removed. Operational requirements are now defined by the Root Server System Advisory Committee of ICANN and are documented in [RSSAC-001].

The root servers are authoritative servers of the unique [RFC2826] root zone (".") [ROOTZONE]. They currently also serve the root- servers.net zone. Some also serve the zone for the .arpa top-level domain [ARPAZONE] [RFC3172]. This document describes the external interface of the root name servers from a protocol viewpoint of the service. It specifies basic requirements for the Internet that DNS clients meet when interacting with a root name service over the public Internet.

The keywords MUST, MUST NOT, REQUIRED, SHALL, SHALL NOT, SHOULD, SHOULD NOT, RECOMMENDED, MAY, and OPTIONAL, when they appear in this document, are to be interpreted as described in BCP 14, [RFC2119].

1.1. Relationship to RFC 2870

This document obsoletes [RFC2870].

   This document and [RSSAC-001] together functionally replace
   [RFC2870].

2. Protocol Requirements

This section describes the minimum high-level protocol requirements. Operative details are documented in [RSSAC-001].

The root name service:

MUST implement core DNS [RFC1035] and clarifications to the DNS [RFC2181].

MUST support IPv4 [RFC791] and IPv6 [RFC2460] transport of DNS queries and responses.

MUST support UDP [RFC768] and TCP [RFC793] transport of DNS queries and responses.

MUST generate checksums when sending UDP datagrams and MUST verify checksums when receiving UDP datagrams containing a non-zero checksum.

MUST implement DNSSEC [RFC4035] as an authoritative name service.

MUST implement extension mechanisms for DNS (EDNS(0)) [RFC6891].

3. Deployment Requirements

The root name service:

MUST answer queries from any entity conforming to [RFC1122] with a valid IP address.

MUST serve the unique [RFC2826] root zone [ROOTZONE].

4. Security Considerations

This document does not specify a new protocol. However, the root name service is a key component of the Internet architecture and play a key role into the overall security of the Internet [RFC2826]. Specific security considerations on the DNS protocols are discussed in their respective specifications. The security considerations on the operational side of the root name servers are discussed in [RSSAC-001].

5. Informative References

   [ARPAZONE]  IANA, ".ARPA Zone Management",
               <http://www.iana.org/domains/arpa>.
   
   [RFC768]    Postel, J., "User Datagram Protocol", STD 6, RFC 768,
               DOI 10.17487/RFC0768, August 1980,
               <http://www.rfc-editor.org/info/rfc768>.
   
   [RFC791]    Postel, J., "Internet Protocol", STD 5, RFC 791,
               DOI 10.17487/RFC0791, September 1981,
               <http://www.rfc-editor.org/info/rfc791>.
   
   [RFC793]    Postel, J., "Transmission Control Protocol", STD 7,
               RFC 793, DOI 10.17487/RFC0793, September 1981,
               <http://www.rfc-editor.org/info/rfc793>.
   
   [RFC1035]   Mockapetris, P., "Domain names - implementation and
               specification", STD 13, RFC 1035, DOI 10.17487/RFC1035,
               November 1987, <http://www.rfc-editor.org/info/rfc1035>.
   
   [RFC1122]   Braden, R., Ed., "Requirements for Internet Hosts -
               Communication Layers", STD 3, RFC 1122,
               DOI 10.17487/RFC1122, October 1989,
               <http://www.rfc-editor.org/info/rfc1122>.
   
   [RFC2119]   Bradner, S., "Key words for use in RFCs to Indicate
               Requirement Levels", BCP 14, RFC 2119,
               DOI 10.17487/RFC2119, March 1997,
               <http://www.rfc-editor.org/info/rfc2119>.
   
   [RFC2181]   Elz, R. and R. Bush, "Clarifications to the DNS
               Specification", RFC 2181, DOI 10.17487/RFC2181, July
               1997, <http://www.rfc-editor.org/info/rfc2181>.
   
   [RFC2460]   Deering, S. and R. Hinden, "Internet Protocol, Version 6
               (IPv6) Specification", RFC 2460, DOI 10.17487/RFC2460,
               December 1998, <http://www.rfc-editor.org/info/rfc2460>.
   
   [RFC2826]   Internet Architecture Board, "IAB Technical Comment on
               the Unique DNS Root", RFC 2826, DOI 10.17487/RFC2826, May
               2000, <http://www.rfc-editor.org/info/rfc2826>.
   
   [RFC2870]   Bush, R., Karrenberg, D., Kosters, M., and R. Plzak,
               "Root Name Server Operational Requirements", BCP 40,
               RFC 2870, DOI 10.17487/RFC2870, June 2000,
               <http://www.rfc-editor.org/info/rfc2870>.
   
   [RFC3172]   Huston, G., Ed., "Management Guidelines & Operational
               Requirements for the Address and Routing Parameter Area
               Domain ("arpa")", BCP 52, RFC 3172, DOI 10.17487/RFC3172,
               September 2001, <http://www.rfc-editor.org/info/rfc3172>.
   
   [RFC4035]   Arends, R., Austein, R., Larson, M., Massey, D., and S.
               Rose, "Protocol Modifications for the DNS Security
               Extensions", RFC 4035, DOI 10.17487/RFC4035, March 2005,
               <http://www.rfc-editor.org/info/rfc4035>.
   
   [RFC6891]   Damas, J., Graff, M., and P. Vixie, "Extension Mechanisms
               for DNS (EDNS(0))", STD 75, RFC 6891,
               DOI 10.17487/RFC6891, April 2013,
               <http://www.rfc-editor.org/info/rfc6891>.
   
   [ROOTZONE]  "Root Zone", <ftp://rs.internic.net/domain/root.zone>.
   
   [RSSAC-001] Root Server System Advisory Committee (RSSAC), "Service
               Expectations of Root Servers", November 2014,
               <https://www.icann.org/en/system/files/files/
               rssac-001-root-service-expectations-04dec15-en.pdf>.

Acknowledgements

Some text was taken from [RFC2870]. The editors of this document would like to sincerely thank the following individuals for valuable contributions to the text: Andrew Sullivan, Simon Perreault, Jean-Philippe Dionne, Dave Thaler, Russ Housley, Alissa Cooper, Joe Abley, Joao Damas, Daniel Karrenberg, Jacques Latour, Eliot Lear, Bill Manning, David Conrad, Paul Hoffman, Terry Manderson, Jari Arkko, and Mark Andrews.

Authors' Addresses

   Marc Blanchet
   Viagenie
   246 Aberdeen
   Quebec, QC  G1R 2E1
   Canada
   
   Email: [email protected]
   URI:   http://viagenie.ca

Lars-Johan Liman
Netnod Internet Exchange
Box 30194
SE-104 25 Stockholm
Sweden

   Email: [email protected]
   URI:   http://www.netnod.se/