Client Subnet in DNS Queries
draft-ietf-dnsop-edns-client-subnet-07
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2016-03-30
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EDIT |
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
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