For domain name servers (DNSs) on the network, one DNS server is planned as the Master DNS server, the Master node of data configuration. In addition, several DNS servers are planned as Slave DNS servers. At least one Slave DNS server needs to be planned.

The system allows for a maximum of 10 Slave DNS servers to make the management easy.

Resolution records in the zone files mainly need to be synchronized between the Master and Slave DNS servers. The resolution records can be synchronized in Push or Pull mode. When the data configured on the Master DNS server changes, you can synchronize the data configurations between Master and Slave DNS servers in any of the preceding modes. Configurations required by two modes are different.

• Push mode: indicates that the Master DNS server initiatively requests data synchronization. The Push mode synchronization will be triggered when the data on the master DNS server is updated. The synchronization is initiated by the master DNS server; therefore, the data synchronization is comparatively timely. This mode requires that the Master DNS server should specify the IP addresses of all the Slave DNS servers in the configuration data. IP addresses of all the Slave DNS servers are identified by the also-notify attribute.
• Pull mode: indicates that Slave DNS servers initiatively request data synchronization. The data synchronization is initiated by Slave DNS servers. Since the time when configuration data on the Master DNS server changes is unknown to Slave DNS servers, Slave DNS servers can only request data synchronization at a fixed interval. Therefore, data synchronization is not in time. The interval between two data synchronization requests is determined by the corresponding parameter. This mode requires that Slave DNS servers should specify the IP address of the Master DNS server in the configuration data.

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