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<blockquote cite="http://www.reseausale.com/">
The DNS configuration files are stored in the /etc/bind directory. The primary configuration file is /etc/bind/named.conf.

The include line specifies the filename which contains the DNS options. The directory line in the /etc/bind/named.conf.options file tells DNS where to look for files. All files BIND uses will be relative to this directory.

The file named /etc/bind/db.root describes the root nameservers in the world. The servers change over time, so the /etc/bind/db.root file must be maintained now and then. This is usually done as updates to the bind9 package. The zone section defines a master server, and it is stored in a file mentioned in the file option.

It is possible to configure the same server to be a caching name server, primary master, and secondary master. A server can be the Start of Authority (SOA) for one zone, while providing secondary service for another zone. All the while providing caching services for hosts on the local LAN.
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              <span style="color: red;"><span style="font-size: small;"><b>  watch this video haw to  install, and configure DNS in a Ubuntu 12.10 server.</b></span></span><br />
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The DNS configuration files are stored in the /etc/bind directory. The primary configuration file is /etc/bind/named.conf. Th...

haw to install and configure DNS in a Ubuntu 12.10 server