Draytek Vigor2133 User Manual page 281

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.
3. When you finish the configuration, please click OK to save and exit this page.
Vigor2133 Series User's Guide 269