Documentation :: DNS Zone
Settings
Zone - a file that describes the correspondence of the domain hosts and their IP addresses. At least two servers are responsible for each DNS zone. One of them is primary, primary, the rest are secondary, secondary. The primary server contains the original DNS database files for its zone. Secondary servers receive this data over the network from the primary server and periodically request the primary server for data updates. If the data on the primary server is updated, the secondary server requests a “zone transfer” —that is, Databases of the required zone. The zone is transferred using the TCP protocol port 53 (unlike requests sent to UDP / 53).
Changes to the DNS database can only be made on the primary server. From the point of view of servicing client requests, the primary and secondary servers are identical, all of them give authoritative answers. It is recommended that the primary and secondary servers be on different networks - to increase the reliability of processing requests in case the network of one of the servers becomes unavailable. DNS servers are not required to be in the domain for which they are responsible.
To create a primary DNS zone, click the Add button → DNS DNS Zone. ICS will ask you to enter the following parameters:
parameter value Zone name The name of the domain for which this zone is responsible DNS servers DNS server Name of the server responsible for this zone (the corresponding NS record will appear in the list of zone records automatically) Administrator email Address of the administrator responsible for this TTL zone (Time To Live) The valid storage time for this resource record in the cache of the non-responsive DNS server in seconds. Update The time interval in seconds after which the secondary server will check if the information needs to be updated. Retry attempt The time interval in seconds after which the secondary server will retry accesses upon failure. Obsolescence The time interval in seconds after which the secondary server will consider its information obsolete. Negative TTL The value of the lifetime of information on caching servers ((ttl) in subsequent resource records).
Attention! If you are not an experienced system administrator, do not change the default settings! These settings are suitable for the vast majority of created DNS zones.
Access
The “Access” tab allows you to define external addresses that have the right to access the information in this zone. By default, reading is allowed from all networks.
After creating the zone, you can go to adding records