Siemens Gigaset Owner's Manual page 40

Intrusion Detection
The Intrusion Detection feature of the Gigaset Router limits the access of incoming traf-
fic from the WAN port. When the SPI feature is turned on, all incoming packets will be
blocked unless certain types of traffic are checked by the users.
When the user checks certain types of traffic, only that particular type of traffic initiated
from the Internal LAN will be allowed. For example, if the user only checks FTP service
from the Stateful Packet Inspection, all incoming traffic will be blocked except the FTP
connections initiated from the local LAN.
Stateful Packet Inspection This option allows you to select different application
types that are using dynamic port numbers. If you
need to use the Stateful Packet Inspection (SPI) for
blocking packets, check the radio button in the Enable
SPI and Anti-DoS firewall protection field and then
check the inspection type that you need, such as
Packet Fragmentation, TCP Connection, UDP Ses-
sion, FTP service, H.323 Service and TFTP Service.
Configuring the Gigaset Router
39