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Firewall
65
Figure 41 Virtual DMZ Screen
Stateful Packet Inspection (SPI) inspects required blocks packets at
SPI
the application layer. SPI also maintains TCP and UDP session
information, including timeouts and the number of active sessions, and
provides the ability to detect and prevent certain types of network
attacks such as DoS attacks.
Denial of Service (DoS) attacks are aimed at devices and networks
with a connection to the Internet. The goal is not to steal information,
but to disable a device or network so users no longer have access to
network resources.
To configure SPI information on your Router:
1 Select Firewall from the main menu, then select the SPI tab to display
the SPI screen
(Figure
42):
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