D-Link DNS-320L User Manual page 202

Section 4 - Configuration
Select IPv4 or IPv6 and then enter the IP address of a machine
you wish to block. Select Permanent if you wish to block the
IP address permanently or Temporary if you wish to set a time
frame.
If you selected permanent, click Apply and continue.
If you selected Temporary, then select a time frame and click
Apply to continue.
DNS-320L
D-Link ShareCenter™ User Manual
197