Draytek Vigor2760 Series User Manual page 124

Strict Security Checking - All the packets, while
transmitting through Vigor router, will be filtered by
firewall settings configured by Vigor router. When the
resource is inadequate, the packets will be blocked if Strict
Security Checking is enabled. If Strict Security Checking is
not enabled, then the packets will pass through the router.
Vigor2760 Series User's Guide 114