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Security
Firewall
The ADSL Wireless Modem 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 Wireless Modem 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.
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.
Access Control
Access Control allows users to define the outgoing traffic permitted or not-permitted
through the WAN interface. The default is to permit all outgoing traffic.
To add the PC to the filtering table:
1 Click 'Add PC' on the Access Control screen.
2 Define the appropriate settings for client PC services.
3 Click 'OK' and then click 'SAVE SETTINGS' to save your settings.
MAC Filter
The ADSL Wireless Modem Router can also limit the network access based on the
MAC address. The MAC Filtering Table allows the ADSL Wireless Modem Router to
enter up to 32 MAC addresses that are not allowed access to the WAN port.
1 Click Yes to enable, or No to disable this function.
2 Enter the MAC address in the space provided and click 'Save Settings' to confirm.
URL Blocking
The ADSL Wireless Modem Router allows the user to block access to web sites by
entering either a full URL address or just a keyword. This feature can be used to
protect children from accessing violent or pornographic web sites.
You can define up to 30 sites here.
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