SMC Networks 7908A-ISP, Руководство пользователя

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C
ONFIGURING THE
V
O
IP ADSL R
OUTER
4-42
Firewall
The 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 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.
(For details see page 4-49.)
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.