DNS in Closed Intranets | DNS in Action

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Table Of Contents

DNS in Action

By : CP Books a.s.

2.3 (3)

DNS in Action

2.3 (3)

By: CP Books a.s.

Overview of this book

The Domain Name System is one of the foundations of the internet. It is the system that allows the translation of human-readable domain names into machines-readable IP addresses and the reverse translation of IP addresses into domain names. This book describes the basic DNS protocol and its extensions; DNS delegation and registration, including for reverse domains; using DNS servers in networks that are not connected to the internet; and using DNS servers on firewall machines. Many detailed examples are used throughout the book to show perform various configuration and administration tasks.

DNS in Action

DNS in Action

Credits

Credits

About the Authors

About the Authors

Preface

Preface

Free Chapter

Domain Name System

Domain Name System

1.1 Domains and Subdomains

1.2 Name Syntax

1.3 Reverse Domains

1.4 Domain 0.0.127.in-addr.arpa

1.5 Zone

1.6 Reserved Domains and Pseudodomains

1.7 Queries (Translations)

1.8 Resolvers

1.9 Name Server

1.10 Forwarder Servers

DNS Protocol

DNS Protocol

2.1 Resource Records

2.2 DNS Protocol

2.3 DNS Query

DNS Extension

DNS Extension

3.1 DNS Update

3.2 DNS Notify

3.3 Incremental Zone Transfer

3.4 Negative Caching (DNS NCACHE)

3.5 DNS IP version 6 Extension

3.6 DNS Security Protocols

3.7 TSIG

3.8 Saving Certificates to DNS

Name Server Implementation

Name Server Implementation

4.1 DNS Database

4.2 RR Format

4.3 Name Server Implementation in BIND

4.4 Microsoft’s Native Implementation of DNS in Windows 2000/2003

Tools for DNS Debugging and Administration

Tools for DNS Debugging and Administration

5.1 Tools for DNS Debugging

5.2 The rndc Program

5.3 Errors in DNS Configuration

Domain Delegation and Registration

Domain Delegation and Registration

6.1 Example 1

6.2 Example 2

6.3 Domain Registration

Reverse Domain Delegation

Reverse Domain Delegation

Server ns.company.com

Server ns.provider.net

Server ns.ripe.net (authoritative server for a superior domain)

Server ns.company.com

Server ns.branch.company.com

Internet Registry

Internet Registry

8.1 International Organizations

8.2 Regional Internet Registry (RIR)

8.3 IP Addresses and AS Numbers

8.4 Internet Registry

8.5 Delegation of Second-Level Domains

DNS in Closed Intranets

DNS in Closed Intranets

9.1 Configuring a Root Name Server on the Same Server (BIND Version 4)

9.2 Configuring a Root Name Server on a Separate Server (BIND Version 4)

9.3 Root DNS Server in Windows 2000/2003

DNS and Firewall

DNS and Firewall

10.1 Shared DNS for Internet and Intranet

10.2 Name Server Installed on Firewall

10.3 Dual DNS

10.4 End Remarks

Country Codes and RIRs

Country Codes and RIRs

Index

Index

Chapter 9. DNS in Closed Intranets

A closed intranet is nothing but a network that is not connected to the Internet. One would say that DNS is very simple to configure in relation to closed intranets. What is the problem then?

Your company uses the company.com domain, and you have very little difficulty in configuring your domain’s name server; in fact, you configure the primary name server for your company.com domain on one machine and the secondary one on another.

You direct all your clients’ resolvers to these name servers. The following figure shows a client asking the name server configured by you for a translation of the name server.company.com to its IP address:

Figure 9.1: Translation of the name server.company.com to its IP address

Everything is working fine until the client sends an incorrect request for server.ompany.com instead of the correct server.company.com (i.e., there is a one-character error).

Common mistakes like this result in additional time taken to find the server, and...

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Tech Concepts

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Programming languages

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