Draytek Vigor3300 Series, Руководство пользователя, Страница: 94 / 213

Vigor3300 Series User’s Guide
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The DoS function helps to detect and mitigates DoS attacks. These include flooding-type
attacks and vulnerability attacks. Flooding-type attacks attempt to use up all your system's
resources while vulnerability attacks try to paralyze the system by offending the vulnerabilities
of the protocol or operation system.
In the Firewall group, click the DOS option. You will see the following page. The DoS
Defense Engine inspects each incoming packet against the attack signature database. Any
packet that may paralyze the host in the security zone is blocked. The DoS Defense Engine
also monitors traffic behavior. Any anomalous situation violating the DoS configuration is
reported and the attack is mitigated.
DoS Defense Enables or disables the DoS Defense function. The default
value is Disable .
Enable SYN Flood Defense Activates the SYN flood defense function. If the amount of
TCP SYN packets from the Internet exceeds the user-defined
threshold value, the router will be forced to randomly discard