Believing NSEC records in the DNS root.
draft-wkumari-dnsop-cheese-shop-00

Network Working Group                                          W. Kumari
Internet-Draft                                                    Google
Intended status: Informational                                 G. Huston
Expires: April 10, 2016                                            APNIC
                                                         October 8, 2015

                Believing NSEC records in the DNS root.
                   draft-wkumari-dnsop-cheese-shop-00

Abstract

   This document cuts down on junk queries to the DNS root and improves
   performance by answering queries locally from compliant resolvers.
   It does this by actually believing the NSEC responses.

   [ Ed note: Text inside square brackets ([]) is additional background
   information, answers to frequently asked questions, general musings,
   etc.  They will be removed before publication.]

   [ This document is being collaborated on in Github at:
   https://github.com/wkumari/draft-wkumari-dnsop-cheese-shop.  The most
   recent version of the document, open issues, etc should all be
   available here.  The authors (gratefully) accept pull requests ]

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/.

   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 April 10, 2016.

Copyright Notice

   Copyright (c) 2015 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Kumari & Huston          Expires April 10, 2016                 [Page 1]
Internet-Draft          If I've told you once...            October 2015

   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.  Background  . . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Believing NSEC records. . . . . . . . . . . . . . . . . . . .   2
     2.1.  Requirements notation . . . . . . . . . . . . . . . . . .   3
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   3
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   3
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   3
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   3
   Appendix A.  Changes / Author Notes.  . . . . . . . . . . . . . .   4
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   4

1.  Background

   [ This section may be removed before publication... but I'd prefer
   not, it provides useful context ]

   The title of this draft (draft-wkumari-dnsop-cheese-shop) comes from
   a famous Monty Python skit - "The Cheese Shop".  Knowledge of the
   skit is mandatory background knowledge for this document...

   Video here: https://www.youtube.com/watch?v=PPN3KTtrnZM

2.  Believing NSEC records.

   This is a simply a refinement of
   [I-D.fujiwara-dnsop-nsec-aggressiveuse], for a limited use case.
   Fiull credit to the authors of the aforementioned draft, and this
   draft does not replace that draft, nor remove the need for the
   broader consideration of the use of NSEC records as described in
   [I-D.fujiwara-dnsop-nsec-aggressiveuse].

   The scope of this document is addressed specifically to recursive
   validating resolvers when querying the root zone.

Kumari & Huston          Expires April 10, 2016                 [Page 2]
Internet-Draft          If I've told you once...            October 2015

   If the (DNSSEC validated) answer to a query to a root server is an
   NXDOMAIN then the resolver SHOULD cache the NSEC record provided in
   the response.  The resolver should NOT send further queries for names
   within the range of the NSEC record for the lifetime of the cached
   NSEC TTL.  Instead, the resolver SHOULD answer these queries directly
   with NXDOMAIN (and NSEC records if so signalled by EDNS).  They
   SHOULD set the AA bit and AD bits.

2.1.  Requirements notation

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

3.  IANA Considerations

   This document contains no IANA considerations.

   [ We MAY want to add something about setting the NSEC TTL
   appropriately?! ]

4.  Security Considerations

   TODO: Fill this out!

5.  Acknowledgements

   The authors wish to thank some folk.

6.  References

6.1.  Normative References

   [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>.

6.2.  Informative References

   [I-D.fujiwara-dnsop-nsec-aggressiveuse]
              Fujiwara, K. and A. Kato, "Aggressive use of NSEC/NSEC3",
              draft-fujiwara-dnsop-nsec-aggressiveuse-01 (work in
              progress), July 2015.

Kumari & Huston          Expires April 10, 2016                 [Page 3]
Internet-Draft          If I've told you once...            October 2015

Appendix A.  Changes / Author Notes.

   [RFC Editor: Please remove this section before publication ]

   From -00 to -01.

   o  Nothing changed in the template!

Authors' Addresses

   Warren Kumari
   Google
   1600 Amphitheatre Parkway
   Mountain View, CA  94043
   US

   Email: warren@kumari.net

   Geoff Huston
   APNIC
   6 Cordelia St
   South Brisbane QLD  4001
   AUS

   Email: gih@apnic.net

Kumari & Huston          Expires April 10, 2016                 [Page 4]