The DNS Filtering Global Settings allow you to enable or disable the use of the White List, as well as specify the values to be used for forged IP addresses.
To configure the DNS Filtering Global Settings
Navigate to POLICY | DNS Security > Settings.
Click DNS Filtering.
Click Global Settings.
Select Enable White List to enable the use of the White List. (This option is enabled by default.)
In the Forged IPv4 Address field, enter the value to be used for the forged IPv4 IP address.
In the Forged IPv6 Address field, enter the value to be used for the forged IPv6 IP address.