User's Manual

DRG600WiFi User Guide Advanced Features
Page 83 of 104
Security
Figure 41. Security Screen
Firewall
URL Filter
You can filter out webpages by specifying which URLs to block. Click URL Filter to access the URL Filter
screen. See “URL Filter Screen” on page 85 for more details.
Enable DoS
Firewall
If enabled, DoS (Denial of Service) attacks will be detected and blocked. The default is
enabled. It is strongly recommended that this setting be left enabled..
Note:
A DoS attack does not attempt to steal data or damage your PCs, but overloads your Internet
connection so you can not use it - the service is unavailable.
This device uses "Stateful Inspection" technology. This system can detect situations where
individual TCP/IP packets are valid, but collectively they become a DoS attack.
Threshold
This setting affects the number of "half-open" connections allowed.
A "half-open" connection arises when a remote client contacts the Server with a connection
request, but then does not reply to the Server response.
Threshold is the optimum number of "half-open" connections allowed and it depends on
many factors. The most important factor is the available bandwidth of your Internet
connection.
Select the setting to match the bandwidth of your Internet connection.