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Decreasing Access Time to Root Servers by Running One on Loopback (RFC7706) Disclosure Number: IPCOM000245062D
Original Publication Date: 2015-Nov-01
Included in the Prior Art Database: 2016-Feb-07
Document File: 24 page(s) / 24K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

W. Kumari: AUTHOR [+1]


DNS recursive resolvers have to provide answers to all queries from their customers, even those for domain names that do not exist. For each queried name that has a top-level domain (TLD) that is not in the recursive resolver's cache, the resolver must send a query to a root server to get the information for that TLD, or to find out that the TLD does not exist. Typically, the vast majority of queries going to the root are for names that do not exist in the root zone, and the negative answers are cached for a much shorter period of time. A slow path between the recursive resolver and the closest root server has a negative effect on the resolver's customers.

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Internet Engineering Task Force (IETF)                         W. Kumari Request for Comments: 7706                                        Google Category: Informational                                       P. Hoffman ISSN: 2070-1721                                                    ICANN                                                            November 2015

    Decreasing Access Time to Root Servers by Running One on Loopback


   Some DNS recursive resolvers have longer-than-desired round-trip    times to the closest DNS root server.  Some DNS recursive resolver    operators want to prevent snooping of requests sent to DNS root    servers by third parties.  Such resolvers can greatly decrease the    round-trip time and prevent observation of requests by running a copy    of the full root zone on a loopback address (such as    This document shows how to start and maintain such a copy of the root    zone that does not pose a threat to other users of the DNS, at the    cost of adding some operational fragility for the operator.

Status of This Memo

   This document is not an Internet Standards Track specification; it is    published for informational purposes.

   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 5741.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at

Kumari & Hoffman              Informational                     [Page 1]
 RFC 7706                Running Root on Loopback           November 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    ( 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.  Introduct...