SMC Networks SMC7904BRA - Manual (Page 85)

C
ONFIGURING THE
B
ARRICADE
ADSL R
OUTER
4-40
FIREWALL
The Barricade ADSL Router ’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 firewall function of the Barricade ADSL Router 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 page 4-47 for details.)
The firewall does not significantly affect system performance, so we advise
leaving it enabled to protect your network. Select Enable and click the
“SAVE SETTINGS” button to open the Firewall submenus.