5.9 Security
This screen allows you to set Firewall and other security-related options.
Figure 31: Security Screen
Data - Security Screen
Firewall
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'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.
63
