Extended DNS Errors
draft-wkumari-dnsop-extended-error-00

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Last updated 2017-02-27
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Network Working Group                                          W. Kumari
Internet-Draft                                                    Google
Intended status: Informational                                   E. Hunt
Expires: August 31, 2017                                             ISC
                                                               R. Arends
                                                                 Nominet
                                                             W. Hardaker
                                                                 USC/ISI
                                                       February 27, 2017

                          Extended DNS Errors
                 draft-wkumari-dnsop-extended-error-00

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.

   [ Note: I always have a hard time with EDNS terminology - I'm saying
   that Extended DNS Errors are carried as EDNS Options, but is this
   correct?  They are optional TLVs in "options" in RDATA in OPTion RR ,
   but that's not readable. ]

   [ Open question: The document currently defines a registry for
   errors.  It has also been suggested that the option also carry human
   readable (text) messages, so 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

Kumari, et al.           Expires August 31, 2017                [Page 1]
Internet-Draft     draft-wkumari-dnsop-extended-error      February 2017

   working documents as Internet-Drafts.  The list of current Internet-
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   Internet-Drafts are draft documents valid for a maximum of six months
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   This Internet-Draft will expire on August 31, 2017.

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
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Table of Contents

   1.  Introduction and background . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements notation . . . . . . . . . . . . . . . . . .   3
   2.  Extended Error EDNS0 option format  . . . . . . . . . . . . .   4
   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
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