3Com OfficeConnect 3CRWDR200A-75, Руководство пользователя

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Firewall 65
Figure 41
Virtual DMZ Screen
SPI
Stateful Packet Inspection (SPI) inspects required blocks packets at
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 ):