Decreasing Access Time to Root Servers by Running One on Loopback (RFC7706)
Original Publication Date: 2015-Nov-01
Included in the Prior Art Database: 2016-Feb-07
Internet Society Requests For Comment (RFCs)
W. Kumari: AUTHOR [+2]
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.
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 127.0.0.1). 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 http://www.rfc-editor.org/info/rfc7706.
Kumari & Hoffman Informational [Page 1]
RFC 7706 Running Root on Loopback November 2015
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