Extended DNS Errors
draft-wkumari-dnsop-extended-error-02

Document Type Active Internet-Draft (dnsop WG)
Last updated 2017-08-08 (latest revision 2017-07-17)
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Intended RFC status Informational
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Network Working Group                                          W. Kumari
Internet-Draft                                                    Google
Intended status: Informational                                   E. Hunt
Expires: January 18, 2018                                            ISC
                                                               R. Arends
                                                                 Nominet
                                                             W. Hardaker
                                                                 USC/ISI
                                                             D. Lawrence
                                                     Akamai Technologies
                                                           July 17, 2017

                          Extended DNS Errors
                 draft-wkumari-dnsop-extended-error-02

Abstract

   This document defines an extensible method to return additional
   information about the cause of DNS errors.  The primary use case is
   to extend SERVFAIL to provide additional information about the cause
   of DNS and DNSSEC failures.

   [ Open question: The document currently defines a registry for
   errors.  It has also been suggested that the option also carry human
   readable (text) messages, to allow the server admin to provide
   additional debugging information (e.g: "example.com pointed their NS
   at us.  No idea why...", "We don't provide recursive DNS to
   192.0.2.0.  Please stop asking...", "Have you tried Acme Anvil and
   DNS?  We do DNS right..." (!).  Please let us know if you think text
   is needed, or if a 16bit FCFS registry is expressive enough. ]

   [ Open question: This document discusses extended *errors*, but it
   has been suggested that this could be used to also annotate *non-
   error* messages.  The authors do not think that this is a good idea,
   but could be persuaded otherwise. ]

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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

Kumari, et al.          Expires January 18, 2018                [Page 1]
Internet-Draft     draft-wkumari-dnsop-extended-error          July 2017

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on January 18, 2018.

Copyright Notice

   Copyright (c) 2017 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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction and background . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements notation . . . . . . . . . . . . . . . . . .   3
   2.  Extended Error EDNS0 option format  . . . . . . . . . . . . .   3
   3.  Use of the Extended DNS Error option  . . . . . . . . . . . .   4
   4.  Defined Extended DNS Errors . . . . . . . . . . . . . . . . .   5
     4.1.  Extended DNS Error Code 1 - DNSSEC Bogus  . . . . . . . .   5
     4.2.  Extended DNS Error Code 2 - DNSSEC Indeterminite  . . . .   5
     4.3.  Extended DNS Error Code 3 - Lame  . . . . . . . . . . . .   5
     4.4.  Extended DNS Error Code 4 - Prohibited  . . . . . . . . .   5
     4.5.  Extended DNS Error Code 5 - TooBusy . . . . . . . . . . .   6
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   6.  Open questions  . . . . . . . . . . . . . . . . . . . . . . .   7
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   7
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Appendix A.  Changes / Author Notes.  . . . . . . . . . . . . . .   8
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