Draytek Vigor2710 Series User Manual page 159

Strict Security Checking - All the packets, while transmitting
through Vigor router, will be filtered by firewall settings
configured by Vigor router if Strict Security Firewall is
enabled. If the firewall system does not have any response
(pass or block) for these packets, such as no response coming
from Anti-Spam server, then the router's firewall will block
the packets directly.
In addition, you can restrict the strict security checking just be
done by specified server and conditions such as Anti-Virus,
Anti-Spam, In-Sequence and APP Enforcement. Thus, the
packets not only must be filtered by general rules by Firewall,
but also must be filtered by the items selected in Strict
Security Checking. Such work can ensure the data security
transferring via network.
APP Enforcement – Check this box to execute the critical
checking for all the files transferred via IM/P2P.
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Vigor2710 Series User's Guide