You can change the values for refresh, retry, expire, and minimum time-to-life (TTL) to meet the needs of your zone configuration. You may want to lower the refresh and retry rates for zones that undergo frequent changes.
You can make this DNS zone either a master zone or a slave zone by clicking the appropriate button. When setting up a slave zone, make sure that you provide the name of an appropriate DNS master server.
To save the zone settings, make the desired changes, then click Apply.