D-Link DWR-966 User Manual page 41

Advanced Firewall
This section displays the firewall security settings of the DWR-966. The
security levels are grouped into a set of rules corresponding to
maximum, typical, and minimum security settings. Advanced users can
supplement these rules with custom parental controls or port mapping
rules as needed. Select from one of the three security modes to
protect the local network from Internet intrusion:
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