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The BIND DNS server software consists of a name server daemon called named, several sample configuration files, and resolver libraries. As of 1998, a new version of BIND, beginning with the series number 8.x, implemented a new configuration file using a new syntax. Recently version 9.0 was released, adding new security features. Older versions, which begin with the number 4.x, use a different configuration file with an older syntax. Red Hat currently installs the newer 9.x version of BIND. The name of the BIND name server daemon is named. To operate your machine as a name server, simply run the named daemon with the appropriate configuration. The named daemon listens for resolution requests and provides the correct IP address for the requested host name. You can use the Name Daemon Controller, rndc, utility provided with BIND to start, stop, restart, and check the status of the server as you test its configuration. rndc with the stop command stops named and, with the start command, starts it again, reading your named.conf file. rndc with the help command provides a list of all rndc commands. Once
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your name server is running, you can test it using the dig or nslookup utilities, which queries a name server, providing information about hosts and domains. If you start dig with no arguments, it enters an interactive mode where you can issue different dig commands to refine your queries. Numerous other DNS tools are also available, such as nslint and host. Check the DNS Resource Directory at www.dns.net/dnsrd for a listing. Table 25-3 lists several DNS administrative tools. Table 25-3: BIND Diagnostic and Administration Tools Description Domain Information Groper, tool to obtain information on a DNS server. Preferred over nslookup. Simple lookup of hosts. Tool to query DNS servers for information about domains and hosts. Remote Name Daemon Controller is an administrative tool for managing a DNS server (version 9.x). Name Daemon Controller (version 8.x).
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On Red Hat systems, the named daemon is started using a startup script in the /etc/rc.d/init.d directory called named. You can use this script to start, stop, and restart the daemon using the stop, start, and restart arguments. You can invoke the script with the service command, as shown here.
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On Red Hat systems, named runs as a standalone daemon, starting up when the system boots and constantly runs. If you don't want named to start up automatically, you can use the System V Runlevel Editor or Setup to change its status.
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You configure a DNS server using a configuration file, several zone files, and a cache file. The part of a network for which the name server is responsible is called a zone. A zone is not the same as a domain, because in a large domain you could have several zones, each with its own name server. You could also have one name server service several zones. In this case, each zone has its own zone file. The zone files hold resource records that provide hostname and IP address associations for computers on the network for which the DNS server is responsible. Zone files exist for the server's network and the local machine. Zone entries are defined in the named.conf file. Here, you place zone entries for your master, slave, and forward DNS servers. The most commonly used zone types are described here:
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Master zone This is the primary zone file for a network. It holds the mappings from domain names to IP addresses for all the hosts on the network. Slave zone These are references to other DNS servers for your network. Your network can have a master DNS server and several slave DNS servers to help carry the workload. A slave DNS server automatically copies its configuration files, including all zone files, from the master DNS server. Any changes to the master configuration files trigger an automatic download of these files to the slave servers. In effect, you
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only have to manage the configuration files for the master DNS server, as they are automatically copied to the slave servers. Forward zone The forward zone lists name servers outside your network that should be searched if your network's name server fails to resolve an address. IN-ADDR.ARPA zone DNS can also provide reverse resolutions, where an IP address is used to determine the associated domain name address. Such lookups are provided by IN-ADDR.ARPA zone files. Each master zone file usually has a corresponding IN-ADDR.ARPA zone file to provide reverse resolution for that zone. For each master zone entry, a corresponding reverse mapping zone entry named INADDR.ARPA also exists, as well as one for the localhost. This entry performs reverse mapping from an IP address to its domain name. The name of the zone entry uses the domain IP address, which is the IP address with segments listed starting from the host, instead of the network. So, for the IP address 192.168.1.4 where 4 is the host address, the corresponding domain IP address is 4.1.168.192, listing the segments in reverse order. The reverse mapping for the localhost is 0.0.127. Hint zone A hint zone specifies the root name servers and is denoted by a period (.).A DNS server is normally connected to a larger network, such as the Internet, which has its own DNS servers. DNS servers are connected this way hierarchically, with each server having its root servers to which it can send resolution queries. The root servers are designated in the hint zone. Note On Red Hat you can use bindconf, the BIND Configuration Tool, to configure a DNS server for a simple local network. bindconf provides a Gnome interface for setting up the master, slave, forward, and IN-ADDR.ARPA zones you would need for a server. Be aware though that it will overwrite your /etc/named.conf file. bindconf can be accessed from the Gnome System menu.
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