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Using named.conf Options
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Before you create the database files that you refer to in the named.conf file and its related files, let s have a look at some of the options that you can use in the /etc/bind/named.conf file and its related /etc/bind/named.conf.local and /etc/bind/named.conf.options files. Ubuntu Server uses the file /etc/bind/named.conf.options to include options in the DNS configuration. This file is included with the line include "/etc/bind/named.conf.options"; in /etc/bind/named.conf. Listing 9-4 shows the file as it is by default.
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CHAPTER 9 CONFIGURING NETWORK INFRASTRUCTURE SERVICES
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Listing 9-4. The /etc/bind/named.conf.options File Contains Generic Options for Your bind Name Server root@RNA:~# cat /etc/bind/named.conf.options options { directory "/var/cache/bind"; // // // // // If there is a firewall between you and name servers you want to talk to, you might need to uncomment the query-source directive below. Previous versions of BIND always asked questions using port 53, but BIND 8.1 and later use an unprivileged port by default.
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// query-source address * port 53; // // // // If your ISP provided one or more IP addresses for stable name servers, you probably want to use them as forwarders. Uncomment the following block, and insert the addresses replacing the all-0's placeholder.
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// forwarders { // 0.0.0.0; // }; auth-nxdomain no; # conform to RFC1035 listen-on-v6 { any; }; // // // // // // By default, name servers should only perform recursive domain lookups for their direct clients. If recursion is left open to the entire Internet, your name server could be used to perform distributed denial-of-service attacks against other innocent computers. For more information on DDoS recursion: http://cve.mitre.org/cgi-bin/cvename.cgi name=CVE-2006-0987
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allow-recursion { localnets; }; // // // // If you have DNS clients on other subnets outside of your server's "localnets", you can explicitly add their networks without opening up your server to the Internet at large: allow-recursion { localnets; 192.168.0.0/24; };
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// If your name server is only listening on 127.0.0.1, consider: // allow-recursion { 127.0.0.1; }; };
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CHAPTER 9 CONFIGURING NETWORK INFRASTRUCTURE SERVICES
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As you see in the example file in Listing 9-4, you have quite a few options. In the example file, many options are disabled by default and others are just not available. Let s have a look at some of the more common options: options { .... };: Use this statement to indicate the start and the end of the section that contains the options. All generic options need to be in this section, so notice the structure used by this statement. It starts with a bracket, it ends with a bracket, and all specific options are defined between the brackets. When putting this in manually, do not forget the semicolon after the last bracket. directory "/var/cache/bind";: You can use this parameter to define the location where all DNS configuration files are stored. If an incomplete file name is used anywhere in one of the DNS configuration files, the DNS name server looks for it in this directory. If, however, an absolute file name is used, it just follows the absolute file name. Also note the semicolon at the end of the line; this is an important syntax feature. notify no;: This option indicates that slave servers should not be notified of changes, which leaves it completely to the slave server to make sure that it is up to date. If you want an alert to be sent to a slave server when a change occurs, change this setting to notify yes;. forwarders;: By default, if your DNS server gets a request to resolve a name for which it is not responsible itself, it starts querying a root server of the DNS hierarchy to find the required information. You can change this behavior by using a forwarder, which is another DNS name server that typically has a large cache that it uses to resolve names very quickly. You could, for example, use your Internet provider s DNS name server as a DNS forwarder.
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