TAILIEUCHUNG - Chapter-21-The Domain Name Service

Ever since the beginning of the ARPAnet, systems have had both names and IP addresses. UNIX systems, as well as many others who have copied the BSD IP implementation, used the file /etc/hosts to convert between names and addresses. This file contains a list of IP addresses and the corresponding host names, one per line. | 2 April 2003 17 00 47 The Complete FreeBSD page 363 In this chapter Domains and zones Setting up a name server Passive DNS usage Name server on a standalone system Name server on an end-user network Reverse lookup Slave name servers The next level down delegating zones Messages from named Upgrading a Version 4 configuration Looking up DNS information Checking DNS for correctness DNS security 21 The Domain Name Service Ever since the beginning of the ARPAnet systems have had both names and IP addresses. UNIX systems as well as many others who have copied the BSD IP implementation used the file etc hosts to convert between names and addresses. This file contains a list of IP addresses and the corresponding host names one per line. It s clearly impossible to have an etc hosts file that describes the complete Internet. Even if you had disk space the number of updates would overload your network. The solution is a distributed database the Domain Name System or DNS. The most common implementation of DNS is BIND the Berkeley Internet Name Domain You ll notice the word Berkeley in there. BIND is part of BSD and it s about the only game in town. Despite these names the daemon that performs the resolution is called named the name daemon pronounced name-dee . DNS provides the information needed to connect to remote systems in the form of Resource Records or RRs. Unfortunately the names of the records aren t overly intuitive. A Address records translate host names to IP addresses. For example one A record tells you that currently has the IP address . These are what most people think of when they hear the name DNS. The name specified in the A record is called the canonical name of the interface and it should be the one to which the PTR record see below refers. 1. Does this sound like an acronym in search of a name v 2003 04 02 03 15 05 363 2 April 2003 17 00 47 The Complete FreeBSD . tools page 364 The Complete FreeBSD

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