Client Subnet in DNS Queries
draft-ietf-dnsop-edns-client-subnet-02

The information below is for an old version of the document
Document Type Active Internet-Draft (dnsop WG)
Last updated 2015-07-06
Replaces draft-vandergaast-edns-client-subnet
Stream IETF
Intended RFC status Informational
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dnsop                                                      C. Contavalli
Internet-Draft                                          W. van der Gaast
Intended status: Informational                                    Google
Expires: January 7, 2016                                     D. Lawrence
                                                     Akamai Technologies
                                                               W. Kumari
                                                                  Google
                                                            July 6, 2015

                      Client Subnet in DNS Queries
                 draft-ietf-dnsop-edns-client-subnet-02

Abstract

   This draft defines an EDNS0 extension to carry information about the
   network that originated a DNS query, and the network for which the
   subsequent response can be cached.

IESG Note

   [RFC Editor: Please remove this note prior to publication ]

   This informational document describes an existing, implemented and
   deployed system.  A subset of the operators using this is at
   http://www.afasterinternet.com/participants.htm . The authors believe
   that it is better to document this system (even if not everyone
   agrees with the concept) than leave it undocumented and proprietary.

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 January 7, 2016.

Contavalli, et al.       Expires January 7, 2016                [Page 1]
Internet-Draft        Client Subnet in DNS Queries             July 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
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   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.  Requirements Notation . . . . . . . . . . . . . . . . . . . .   4
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   5
   5.  Option Format . . . . . . . . . . . . . . . . . . . . . . . .   6
   6.  Protocol Description  . . . . . . . . . . . . . . . . . . . .   7
     6.1.  Originating the Option  . . . . . . . . . . . . . . . . .   7
       6.1.1.  Recursive Resolvers . . . . . . . . . . . . . . . . .   7
       6.1.2.  Stub Resolvers  . . . . . . . . . . . . . . . . . . .   8
       6.1.3.  Forwarders  . . . . . . . . . . . . . . . . . . . . .   9
     6.2.  Generating a Response . . . . . . . . . . . . . . . . . .   9
       6.2.1.  Authoritative Nameserver  . . . . . . . . . . . . . .   9
       6.2.2.  Intermediate Nameserver . . . . . . . . . . . . . . .  11
     6.3.  Handling ECS Responses and Caching  . . . . . . . . . . .  11
       6.3.1.  Caching the Response  . . . . . . . . . . . . . . . .  12
       6.3.2.  Answering from Cache  . . . . . . . . . . . . . . . .  12
     6.4.  Delegations and Negative Answers  . . . . . . . . . . . .  13
     6.5.  Transitivity  . . . . . . . . . . . . . . . . . . . . . .  14
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  15
   8.  DNSSEC Considerations . . . . . . . . . . . . . . . . . . . .  15
   9.  NAT Considerations  . . . . . . . . . . . . . . . . . . . . .  15
   10. Security Considerations . . . . . . . . . . . . . . . . . . .  16
     10.1.  Privacy  . . . . . . . . . . . . . . . . . . . . . . . .  16
     10.2.  Birthday Attacks . . . . . . . . . . . . . . . . . . . .  16
     10.3.  Cache Pollution  . . . . . . . . . . . . . . . . . . . .  17
   11. Sending the Option  . . . . . . . . . . . . . . . . . . . . .  18
     11.1.  Probing  . . . . . . . . . . . . . . . . . . . . . . . .  19
     11.2.  Whitelist  . . . . . . . . . . . . . . . . . . . . . . .  19
   12. Example . . . . . . . . . . . . . . . . . . . . . . . . . . .  20
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