This statement is mutually exclusive with update-policy and applies to master zones only.
The example shows DDNS for three zones: the first disables DDNS explicitly, the second uses an IP-based list, and the third references a key clause.
After updating the zone file
In order to do this, divide the string into blocks that do not exceed 255 characters and concatenate them using quotes.
Below is a sample key for a DKIM TXT record that exceeds 255 character and instructions for adding it.
allow-notify applies to slave zones only and defines a match list, for example, IP address(es) that are allowed to NOTIFY this server and implicitly update the zone in addition to those hosts defined in the masters option for the zone.
The default behaviour is to allow zone updates only from the masters IP(s).
Rather we simply concentrate in a simple configuration of a custom zone and config file for a given domain / host supporting www, mail services. Last thing before we go ahead to check a configuration is to add and IP address af a stable DNS server to a options file.