Smc-networks AR4505GW Instrukcja Użytkownika Pobierz pdf (Strona 76)

ONFIGURING

THE

ADSL R

OUTER

4-38

Firewall

The 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

ADSL Router firewall function 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 4-45 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.

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Smc-networks AR4505GW Instrukcja Użytkownika Strona 76