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Selection and Operation of Secondary DNS Servers (RFC2182)

IP.com Disclosure Number: IPCOM000002741D
Original Publication Date: 1997-Jul-01
Included in the Prior Art Database: 2019-Feb-15
Document File: 12 page(s) / 17K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

R. Elz: AUTHOR [+3]

Related Documents

10.17487/RFC2182: DOI

Abstract

This document discusses the selection of secondary servers for DNS zones.The number of servers appropriate for a zone is also discussed, and some general secondary server maintenance issues considered. This memo provides information for the Internet community. This memo does not specify an Internet standard of any kind.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 15% of the total text.

Network Working Group R. Elz Request for Comments: 2182 University of Melbourne BCP: 16 R. Bush Category: Best Current Practice RGnet, Inc. S. Bradner Harvard University M. Patton Consultant July 1997

Selection and Operation of Secondary DNS Servers

Status of this Memo

This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements. Distribution of this memo is unlimited.

Abstract

The Domain Name System requires that multiple servers exist for every delegated domain (zone). This document discusses the selection of secondary servers for DNS zones. Both the physical and topological location of each server are material considerations when selecting secondary servers. The number of servers appropriate for a zone is also discussed, and some general secondary server maintenance issues considered.

Elz, et al. Best Current Practice [Page 1]

RFC 2182 Selection and Operation of Secondary DNS Servers July 1997

Contents

Abstract ................................................... 1 1 Introduction ............................................... 2 2 Definitions ................................................ 2 3 Secondary Servers .......................................... 3 4 Unreachable servers ........................................ 5 5 How many secondaries? ...................................... 7 6 Finding Suitable Secondary Servers ......................... 8 7 Serial Number Maintenance .................................. 9 Security Considerations .................................... 11 References ................................................. 11 Acknowledgements ........................................... 11 Authors’ Addresses ......................................... 11

1. Introduction

A number of problems in DNS operations today are attributable to poor choices of secondary servers for DNS zones. The geographic placement as well as the diversity of network connectivity exhibited by the set of DNS servers for a zone can increase the reliability of that zone as well as improve overall network performance and access characteristics. Other considerations in server choice can unexpectedly lower reliability or impose extra demands on the network.

This document discusses many of the issues that should be considered when selecting secondary servers for a zone. It offers guidance in how to best choose servers to serve a given zone.

2. Definitions

For the purposes of this document, and only this document, the following definitions apply:

DNS The Domain Name System [RFC1034, RFC1035].

Zone A part of the DNS tree, that is treated as a unit.

Forward Zone A zone containing data mapping names to host addresses, mail exchange targets, etc.

Elz, et al. Best Current Practice [Page 2]

RFC 2182 Selection and Operation of Secondary DNS Servers July 1997

Reverse Zone A zone containing data used to map addresses to names.

Server An implementation of the DNS protocols able to provide answe...

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