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Security Options
This screen allows you to set Firewall and other security-related options.
Data - Security Options Screen
SPI Firewall
Enable DoS
Firewall
Threshold
Figure 40: Security Options Screen
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 pack-
ets are valid, but collectively they become a DoS attack.
This setting affects the number of "half-open" connections al-
lowed.
A "half-open" connection arises when a remote client con-
tacts the Server with a connection request, but then does not
reply to the Server's response.
While the optimum number of "half-open" connections
allowed (the "Threshold") 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.
Security Configuration
65
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