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XRT-811 User's Manual
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 44: 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 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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