Vigor2920 Series User’s Guide
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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 2000
packets per second and 10 seconds, respectively. That means,
when 2000 packets per second received, they will be regarded
as “attack event” and the session will be paused for 10
seconds.
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.
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