Primary DNS
DHCP users can select "From DHCP" to get primary DNS
Address
server's IP address from DHCP or "User-Defined" to manually
enter a value. For static IP users, the default value is blank.
Secondary
Users can manually enter a value when DNS server's primary
DNS Address
address is set to "User-Defined".
NOTE: DHCP users can select to get DNS servers' IP address from DHCP or
manually enter a value. For static IP users, the default value is blank.
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