Definition and Use of DNSSEC Negative Trust Anchors
RFC 7646

Document Type RFC - Informational (September 2015; No errata)
Last updated 2015-10-14
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Document shepherd Tim Wicinski
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IESG IESG state RFC 7646 (Informational)
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IANA IANA review state Version Changed - Review Needed
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Internet Engineering Task Force (IETF)                       P. Ebersman
Request for Comments: 7646                                       Comcast
Category: Informational                                        W. Kumari
ISSN: 2070-1721                                                   Google
                                                            C. Griffiths
                                                                 Nominet
                                                            J. Livingood
                                                                 Comcast
                                                                R. Weber
                                                                 Nominum
                                                          September 2015

          Definition and Use of DNSSEC Negative Trust Anchors

Abstract

   DNS Security Extensions (DNSSEC) is now entering widespread
   deployment.  However, domain signing tools and processes are not yet
   as mature and reliable as those for non-DNSSEC-related domain
   administration tools and processes.  This document defines Negative
   Trust Anchors (NTAs), which can be used to mitigate DNSSEC validation
   failures by disabling DNSSEC validation at specified domains.

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/rfc7646.

Ebersman, et al.              Informational                     [Page 1]
RFC 7646              DNSSEC Negative Trust Anchors       September 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 and Motivation .....................................3
      1.1. Definition of a Negative Trust Anchor ......................3
      1.2. Motivations for Negative Trust Anchors .....................4
           1.2.1. Mitigating Domain Validation Failures ...............4
           1.2.2. Improving End-User Experience .......................4
           1.2.3. Avoiding Switching to a Non-validating Resolver .....5
   2. Use of a Negative Trust Anchor ..................................5
      2.1. Applicability of Negative Trust Anchors ....................6
   3. Managing Negative Trust Anchors .................................7
      3.1. Alerting Users to Negative Trust Anchor Use ................7
   4. Removal of a Negative Trust Anchor ..............................7
   5. Comparison to Other DNS Misconfigurations .......................8
   6. Intentionally Broken Domains ....................................8
   7. Discovering Broken Domains ......................................9
   8. Security Considerations ........................................11
   9. References .....................................................11
      9.1. Normative References ......................................11
      9.2. Informative References ....................................12
   Appendix A.  Configuration Examples ...............................13
     A.1.  NLnet Labs Unbound ........................................13
     A.2.  Internet System Consortium (ISC) BIND .....................14
     A.3.  Nominum Vantio ............................................14
   Acknowledgements ..................................................15
   Authors' Addresses ................................................15

Ebersman, et al.              Informational                     [Page 2]
RFC 7646              DNSSEC Negative Trust Anchors       September 2015

1.  Introduction and Motivation
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