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For example, a company has one domain name and three identical home pages residing on three servers with three different IP addresses.When one user accesses the home page it will be sent to the first IP address.The second user who accesses the home page will be sent to the next IP address, and the third user will be sent to the third IP address.In each case, once the IP address is given out, it goes to the end of the list.A dynamic DNS service provider uses a special program that runs on the user's computer, contacting the DNS service each time the IP address provided by the ISP changes and subsequently updating the DNS database to reflect the change in IP address.An important part of managing server configuration and infrastructure includes maintaining an easy way to look up network interfaces and IP addresses by name, by setting up a proper Domain Name System (DNS).The Cent OS version of this tutorial can be found here.
This provides a central way to manage your internal hostnames and private IP addresses, which is indispensable when your environment expands to more than a few hosts.
The name server is a program that performs the translation at the request of a resolver or another name server.
Primary name server/primary master is the main data source for the zone. This server acquires data about its zone from databases saved on a local disk.
If you are running rndc on additional systems, allow connections to port 953 (or whatever port you have chosen to configure) from these additional systems.
Round robin DNS is usually used for balancing the load of geographically distributed Web servers.