Adding a DNS subzone

DNS zones can be partitioned into subzones, thus creating a DNS hierarchy that best meets your needs. Adding a subzone creates a new zone on the hosting appliance. A pointer is used to link the parent zone to its subzone so queries can be passed to the subzone correctly for DNS resolution.

Assigning a subzone is useful if you want to spread out the DNS service to other departments or groups, enabling them to configure their own records.

Subzones are essentially zones with their own records and data.

To add a DNS subzone on this appliance
  1. In the left menu, click DNS.

  2. Click the link for the zone name where you want to create a subzone.

  3. In the DNS Subzones for this zone section, click Add.

  4. On the Add DNS Subzone page, configure the zone options shown in the following table, then click Add.

Option

Description

DNS subzone name

The name you assign to the DNS subzone.

Master/slave zone

This option enables you specify whether this zone functions as a master or slave zone.

IP address

This is usually the IP address for the corresponding virtual domain that is hosted on the subzone server.

Administrator e-mail

This is the e-mail address of the person assigned to maintain the DNS database for this zone (provided for reference purposes only).

Refresh after

Specifies how frequently the clients update their cache with new DNS entries from the server.

Retry after

Specifies how long the clients will wait to update from the server.

Expire after

Specifies when the zone data in the DNS cache expires.

Minimum TTL

The minimum "time to live" for record data in the client cache.

Master server name

For every slave zone, you need to specify the name of a master server that will update the DNS database.