LevelOne WBR-5400 - Manual (Page 52)

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packet to detect if this packet is valid.
DoS Attack Detection
When this feature is enabled, the router will detect and log the DoS attack comes from the Internet.
Currently, the router can detect the following DoS attack: SYN Attack, WinNuke, Port Scan, Ping of
Death, Land Attack etc.
VPN PPTP/IPSec Pass-Through
Please enable this feature, if you need to establish a PPTP or IPSEC connection that will pass through
this device.