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Table 25-4: Zone Options Description Allows master servers to notify their slave servers when the master zone data changes and updates are needed. Specifies which hosts are allowed to receive zone transfers. Specifies hosts that are allowed make queries.
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Specifies hosts that are allowed to perform recursive queries on the server. Note The named.conf file is a new feature implemented with BIND version 8.x and 9.x. The older BIND 4.x versions use a file called named.boot. This file is no longer used by version 8.x. The syntaxes used in these configuration files differ radically. If you upgrade to 8.x, you can use the named-bootconf.pl Perl script provided with the BIND software to convert your named.boot file to a named.conf file.
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The zone statement is used to specify the domains the name server will service. You enter the keyword zone, followed by the name of the domain placed within double quotes. Do not place a period at the end of the domain name. In the following example, a period is within the domain name, but not at the end, "mytrek.com"; this differs from the zone file, which requires a period at the end of a complete domain name. After the zone name, you can specify the class in, which stands for Internet. You can also leave it out, in which case in is assumed (there are only a few other esoteric classes that are rarely used). Within the zone block, you can place several options (see Table 25-4). Two essential options are type and file. The type option is used to specify the zone's type. The file option is used to specify the name of the zone file to be used for this zone. You can choose from several types of zones: master, slave, stub, forward, and hint. Master specifies that the zone holds master information and is authorized to act on it. A master server was called a primary server in the older 4.x BIND configuration. Slave indicates that the zone needs to update its data periodically from a specified master name server. You use this entry if your name server is operating as a secondary server for another primary (master) DNS server. A stub zone only copies other name server entries, instead of the entire zone. A forward zone directs all queries to name servers specified in a forwarders statement. A hint zone specifies the set of root name servers used by all Internet DNS servers. You can also specify several options that can override any global options set with the options statement. Table 25-5 lists the BIND zone types. The following example shows a simple zone statement for the mytrek.com domain. Its class is Internet, "in," and its type is master. The name of its zone file is usually the same as the zone name, in this case, "mytrek.com".
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zone "mytrek.com" in { type master; file "mytrek.com"; };
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Table 25-5: DNS BIND Zone Types Description Primary DNS zone Slave DNS server. Controlled by a master DNS server Set of root DNS Internet servers
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Table 25-5: DNS BIND Zone Types Description Forwards any queries in it to other servers Like a slave zone, but only holds names of DNS servers
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Other statements, such as acl, server, options, and logging, enable you to configure different features for your name server (see Table 25-6). The server statement defines the characteristics to be associated with a remote name server, such as the transfer method and key ID for transaction security. The control statement defines special control channels. The key statement defines a key ID to be used in a server statement that associates an authentication method with a particular name server (see DNSSEC). The logging statement is used to configure logging options for the name server, such as the maximum size of the log file and a severity level for messages. Table 25-6 lists the BIND statements. Table 25-6: BIND Configuration Statements Description BIND comment in C syntax. BIND comment in C++ syntax. BIND comment in Unix shell and Perl syntax. Defines a named IP address matching list. Includes a file, interpreting it as part of the named.conf file. Specifies key information for use in authentication and authorization. Specifies what the server logs and where the log messages are sent. Global server configuration options and defaults for other statements. Declares control channels to be used by the ndc utility. Sets certain configuration options for the specified server basis. Gives preference to specified networks based on a queries source. Defines DNSSEC keys preconfigured into the server and implicitly trusted. Defines a zone. Defines a view.
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Statement /* comment */ // comment # comment acl include key logging >Option controls server sortlists trusted-keys zone view
The options statement defines global options and can be used only once in the configuration file. An extensive number of options cover such components as forwarding, name checking, directory path names, access control, and zone transfers, among others (see Table 25-7). A complete listing can be found in the BIND documentation. A critically important option found in most configuration files is the directory option, which holds the location of the name server's zone and cache files on your system. The following example is taken from the Red Hat /etc/named.conf file. This example specifies the zone files are located in the /var/named directory. In this directory, you can find your zone files, including those used for your local system.
options { directory "/var/named";
forwarders { 192.168.1.34; 192.168.1.47; }; };
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