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5.9 Security
This screen allows you to set Firewall and other security-related options.
Data - Security Screen
Firewall
Enable DoS
Firewall
Threshold
Figure 31: Security 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 packets are valid,
but collectively they become a DoS attack.
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'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 connec-
tion.
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