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CHAIN Query Requests in DNS (RFC7901) Disclosure Number: IPCOM000246766D
Original Publication Date: 2016-Jun-01
Included in the Prior Art Database: 2016-Jun-29
Document File: 32 page(s) / 35K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

P. Wouters: AUTHOR


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. When DNSSEC [RFC4033] is deployed on such DNS clients, validation requires that the client obtain all the intermediate information from the DNS root down to the queried-for host name, so it can perform DNSSEC validation on the complete chain of trust.

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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


   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

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    ( 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 . . . . . . . . . . . . . . . . . . . . . ....