C
ONFIGURING
THE
BARRICADE
4-30
Firewall
The BARRICADE’s firewall inspects packets at the application layer,
maintains TCP and UDP session information including time-outs and the
number of active sessions, and provides the ability to detect and prevent
certain types of network attacks.
Network attacks that deny access to a network device are called Denial-of-
Service (DoS) attacks. DoS attacks are aimed at devices and networks with
a connection to the Internet. Their goal is not to steal information, but to
disable a device or network so users no longer have access to network
resources.
The BARRICADE protects against the following DoS attacks: IP
Spoofing, Land Attack, Ping of Death, IP with zero length, Smurf Attack,
UDP port loopback, Snork Attack, TCP null scan, and TCP SYN flooding.
(See “Intrusion Detection” on page 4-37 for details.)
The firewall does not significantly affect system performance, so we advise
leaving it enabled to protect your network.
Enable
the firewall feature, and click
Save Settings
to proceed.
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