Draytek Vigor 3200 Series, Руководство пользователя, Страница: 176 / 356

Vigor3200 Series User’s Guide 166
4 4 . . 4 4 . . 4 4 D D o o S S D D e e f f e e n n s s e e
As a sub-functionality of IP Filter/Firewall, there are 15 types of detect/ defense function in
the
DoS Defense setup. The DoS Defense functionality is disabled for default.
Click Firewall and click DoS Defense to open the setup page.
Available settings are explained as follows:
Item Description
Enable Dos Defense Check the box to activate the DoS Defense Functionality.
Select All Click this button to select all the items listed below.
Enable SYN flood
defense Check the box to activate the SYN flood defense function.
Once detecting the Threshold of the TCP SYN packets from
the Internet has exceeded the defined value, the Vigor router
will start to randomly discard the subsequent TCP SYN
packets for a period defined in Timeout. The goal for this is
prevent the TCP SYN packets’ attempt to exhaust the
limited-resource of Vigor router. By default, the threshold and
timeout values are set to 50 packets per second and 10 seconds,
respectively.
Enable UDP flood
defense Check the box to activate the UDP flood defense function. Once
detecting the Threshold of the UDP packets from the Internet
has exceeded the defined value, the Vigor router will start to
randomly discard the subsequent UDP packets for a period
defined in Timeout. The default setting for threshold and
timeout are 150 packets per second and 10 seconds,
respectively.
Enable ICMP flood Check the box to activate the ICMP flood defense function.