Client Subnet in DNS Queries
draft-ietf-dnsop-edns-client-subnet-07

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dnsop                                                      C. Contavalli
Internet-Draft                                          W. van der Gaast
Intended status: Informational                                    Google
Expires: September 22, 2016                                  D. Lawrence
                                                     Akamai Technologies
                                                               W. Kumari
                                                                  Google
                                                          March 21, 2016

                      Client Subnet in DNS Queries
                 draft-ietf-dnsop-edns-client-subnet-07

Abstract

   This document describes an EDNS0 extension that is in active use to
   carry information about the network that originated a DNS query, and
   the network for which the subsequent response can be cached.  Since
   it has some known operational and privacy shortcomings, a revision
   will be worked through the IETF for improvement.

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 September 22, 2016.

Copyright Notice

   Copyright (c) 2016 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

Contavalli, et al.     Expires September 22, 2016               [Page 1]
Internet-Draft        Client Subnet in DNS Queries            March 2016

   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  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Privacy Note  . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Requirements Notation . . . . . . . . . . . . . . . . . . . .   4
   4.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   5.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   6
   6.  Option Format . . . . . . . . . . . . . . . . . . . . . . . .   7
   7.  Protocol Description  . . . . . . . . . . . . . . . . . . . .   8
     7.1.  Originating the Option  . . . . . . . . . . . . . . . . .   8
       7.1.1.  Recursive Resolvers . . . . . . . . . . . . . . . . .   8
       7.1.2.  Stub Resolvers  . . . . . . . . . . . . . . . . . . .   9
       7.1.3.  Forwarding Resolvers  . . . . . . . . . . . . . . . .   9
     7.2.  Generating a Response . . . . . . . . . . . . . . . . . .  10
       7.2.1.  Authoritative Nameserver  . . . . . . . . . . . . . .  10
       7.2.2.  Intermediate Nameserver . . . . . . . . . . . . . . .  12
     7.3.  Handling ECS Responses and Caching  . . . . . . . . . . .  13
       7.3.1.  Caching the Response  . . . . . . . . . . . . . . . .  13
       7.3.2.  Answering from Cache  . . . . . . . . . . . . . . . .  14
     7.4.  Delegations and Negative Answers  . . . . . . . . . . . .  15
     7.5.  Transitivity  . . . . . . . . . . . . . . . . . . . . . .  16
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  17
   9.  DNSSEC Considerations . . . . . . . . . . . . . . . . . . . .  17
   10. NAT Considerations  . . . . . . . . . . . . . . . . . . . . .  17
   11. Security Considerations . . . . . . . . . . . . . . . . . . .  18
     11.1.  Privacy  . . . . . . . . . . . . . . . . . . . . . . . .  18
     11.2.  Birthday Attacks . . . . . . . . . . . . . . . . . . . .  19
     11.3.  Cache Pollution  . . . . . . . . . . . . . . . . . . . .  20
   12. Sending the Option  . . . . . . . . . . . . . . . . . . . . .  21
     12.1.  Probing  . . . . . . . . . . . . . . . . . . . . . . . .  21
     12.2.  Whitelist  . . . . . . . . . . . . . . . . . . . . . . .  22
   13. Example . . . . . . . . . . . . . . . . . . . . . . . . . . .  22
   14. Contributing Authors  . . . . . . . . . . . . . . . . . . . .  24
   15. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  24
   16. References  . . . . . . . . . . . . . . . . . . . . . . . . .  25