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A Summary of Various Mechanisms Deployed at L-Root for the Identification of Anycast Nodes
RFC 7108

Document type: RFC - Informational (January 2014; Errata)
Document stream: ISE
Last updated: 2014-10-21
Other versions: plain text, pdf, html
IETF Conflict Review: conflict-review-jabley-dnsop-anycast-mapping

ISE State: Published RFC
Document shepherd: No shepherd assigned

IESG State: RFC 7108 (Informational)
IANA Action State: None
Responsible AD: (None)
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Independent Submission                                          J. Abley
Request for Comments: 7108                                     Dyn, Inc.
Category: Informational                                     T. Manderson
ISSN: 2070-1721                                                    ICANN
                                                            January 2014

       A Summary of Various Mechanisms Deployed at L-Root for the
                    Identification of Anycast Nodes

Abstract

   Anycast is a deployment technique commonly employed for
   authoritative-only servers in the Domain Name System (DNS).  L-Root,
   one of the thirteen root servers, is deployed in this fashion.

   Various techniques have been used to map deployed anycast
   infrastructure externally, i.e., without reference to inside
   knowledge about where and how such infrastructure has been deployed.
   Motivations for performing such measurement exercises include
   operational troubleshooting and infrastructure risk assessment.  In
   the specific case of L-Root, the ability to measure and map anycast
   infrastructure using the techniques mentioned in this document is
   provided for reasons of operational transparency.

   This document describes all facilities deployed at L-Root to
   facilitate mapping of its infrastructure and serves as documentation
   for L-Root as a measurable service.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This is a contribution to the RFC Series, independently of any other
   RFC stream.  The RFC Editor has chosen to publish this document at
   its discretion and makes no statement about its value for
   implementation or deployment.  Documents approved for publication by
   the RFC Editor are not 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/rfc7108.

Abley & Manderson             Informational                     [Page 1]
RFC 7108           L-Root Anycast Node Identification       January 2014

Copyright Notice

   Copyright (c) 2014 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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions Used in This Document . . . . . . . . . . . . . .   3
   3.  Naming Scheme for L-Root Nodes  . . . . . . . . . . . . . . .   3
   4.  Identification of L-Root Nodes  . . . . . . . . . . . . . . .   3
     4.1.  Use of NSID . . . . . . . . . . . . . . . . . . . . . . .   4
     4.2.  Use of HOSTNAME.BIND/CH/TXT . . . . . . . . . . . . . . .   5
     4.3.  Use of ID.SERVER/CH/TXT . . . . . . . . . . . . . . . . .   6
     4.4.  Use of IDENTITY.L.ROOT-SERVERS.ORG/IN/TXT and .../IN/A  .   6
     4.5.  Use of NODES.L.ROOT-SERVERS.ORG/IN/TXT  . . . . . . . . .   8
   5.  Provisioning of IDENTITY.L.ROOT-SERVERS.ORG . . . . . . . . .   9
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  10
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  10
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  11

1.  Introduction

   The Domain Name System (DNS) is described in [RFC1034] and [RFC1035].
   L-Root, one of the thirteen root servers, is deployed using anycast
   [RFC4786]; its service addresses, published in the A and AAAA
   Resource Record (RR) Sets for "L.ROOT-SERVERS.NET", are made
   available from a substantial number of semi-autonomous servers
   deployed throughout the Internet.  A list of locations served by
   L-Root can be found at [ROOT-SERVERS].

   Various techniques have been used to map deployed anycast
   infrastructure externally, i.e., without reference to inside
   knowledge about where and how such infrastructure has been deployed.
   Motivations for performing such measurement exercises include
   operational troubleshooting and infrastructure risk assessment.  In
   the specific case of L-Root, the ability to measure and map anycast
   infrastructure using the techniques mentioned in this document is
   provided for reasons of operational transparency.

Abley & Manderson             Informational                     [Page 2]

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