CHAIN Query Requests in DNS
RFC 7901
Document | Type | RFC - Experimental (June 2016; No errata) | |
---|---|---|---|
Author | Paul Wouters | ||
Last updated | 2016-06-21 | ||
Replaces | draft-wouters-edns-chain-query | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Reviews | |||
Stream | WG state | Submitted to IESG for Publication | |
Document shepherd | Tim Wicinski | ||
Shepherd write-up | Show (last changed 2015-11-28) | ||
IESG | IESG state | RFC 7901 (Experimental) | |
Action Holders |
(None)
|
||
Consensus Boilerplate | Yes | ||
Telechat date | |||
Responsible AD | Joel Jaeggli | ||
Send notices to | (None) | ||
IANA | IANA review state | Version Changed - Review Needed | |
IANA action state | RFC-Ed-Ack |
Internet Engineering Task Force (IETF) P. Wouters Request for Comments: 7901 Red Hat Category: Experimental June 2016 ISSN: 2070-1721 CHAIN Query Requests in DNS Abstract This document defines an EDNS0 extension that can be used by a security-aware validating resolver configured to use a forwarding resolver to send a single query, requesting a complete validation path along with the regular query answer. The reduction in queries potentially lowers the latency and reduces the need to send multiple queries at once. This extension mandates the use of source-IP- verified transport such as TCP or UDP with EDNS-COOKIE, so it cannot be abused in amplification attacks. Status of This Memo This document is not an Internet Standards Track specification; it is published for examination, experimental implementation, and evaluation. This document defines an Experimental Protocol for the Internet community. This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Not all documents approved by the IESG are a candidate for any level of Internet Standard; see Section 2 of RFC 7841. Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at http://www.rfc-editor.org/info/rfc7901. Wouters Experimental [Page 1] RFC 7901 CHAIN Query Requests in DNS June 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 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 1.1. Requirements Notation . . . . . . . . . . . . . . . . . . 3 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4 3. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 4 4. Option Format . . . . . . . . . . . . . . . . . . . . . . . . 5 5. Protocol Description . . . . . . . . . . . . . . . . . . . . 6 5.1. Discovery of Support . . . . . . . . . . . . . . . . . . 6 5.2. Generate a Query . . . . . . . . . . . . . . . . . . . . 6 5.3. Send the Option . . . . . . . . . . . . . . . . . . . . . 6 5.4. Generate a Response . . . . . . . . . . . . . . . . . . . 7 6. Protocol Considerations . . . . . . . . . . . . . . . . . . . 8 6.1. DNSSEC Considerations . . . . . . . . . . . . . . . . . . 8 6.2. NS Record Considerations . . . . . . . . . . . . . . . . 8 6.3. Session Management . . . . . . . . . . . . . . . . . . . 9 6.4. Negative Trust Anchors . . . . . . . . . . . . . . . . . 9 6.5. Anycast Considerations . . . . . . . . . . . . . . . . . 9 7. Security Considerations . . . . . . . . . . . . . . . . . . . 10 7.1. Additional Work and Bandwidth . . . . . . . . . . . . . . 10 7.2. Amplification Attacks . . . . . . . . . . . . . . . . . . 10 7.3. Privacy Considerations . . . . . . . . . . . . . . . . . 10 8. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . 10 8.1. CHAIN Query for "www.example.com" . . . . . . . . . . . . 10 8.2. Out-of-Path Query for "example.com" . . . . . . . . . . . 12 8.3. Nonexistent Data . . . . . . . . . . . . . . . . . . . . 13 9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 14 9.1. EDNS0 Option Code for CHAIN . . . . . . . . . . . . . . . 14 10. Normative References . . . . . . . . . . . . . . . . . . . . 14 Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 16 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 16 Wouters Experimental [Page 2] RFC 7901 CHAIN Query Requests in DNS June 2016 1. Introduction Traditionally, a DNS client operates in stub mode. For each DNS question the DNS client needs to resolve, it sends a single query to an upstream recursive resolver to obtain a single DNS answer. WhenShow full document text