Book Image

DNS in Action

By : CP Books a.s.
Book Image

DNS in Action

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.

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DNS in Action
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Table of Contents (16 chapters)
DNS in Action
DNS in Action
Credits
Credits
About the Authors
About the Authors
Preface
Preface
Free Chapter
1
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
2
DNS Protocol
DNS Protocol
2.1 Resource Records
2.2 DNS Protocol
2.3 DNS Query
3
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
4
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
5
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
6
Domain Delegation and Registration
Domain Delegation and Registration
6.1 Example 1
6.2 Example 2
6.3 Domain Registration
7
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
8
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
9
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
10
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

3.5 DNS IP version 6 Extension

DNS extension for IP version 6 is defined by RFC 1886, which was later amended and partially replaced by RFC 2874.

3.5.1 AAAA Records

IP version 4 uses the A record for the translation of a name into an IP address. The AAAA record was initially introduced for IP version 6. The difference is that the AAAA record has in the IP address field a 16-byte IP version 6 address and not a 4-byte address. The use of the AAAA record will not prevail in the future, though.

3.5.2 A6 Records

RFC 2874 replaces the AAAA record with the A6 record.

The A6 record is used for interfaces using IP version 6 addressing. Where an A record has an IP address, the RDATA field of the A6 record has, for example, the following form:

64 ::1244:67E3:589A:9ABC subnet.isp.com

with 64 being the prefix length (number of prefix bits), ::1244:67E3:589A:9ABC being the final part of the address suffix, and subnet.isp.com being the prefix name. Therefore the complete A6 record may look as follows:

www...
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