The Wireless ADSL2+ 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 Wireless ADSL2+ 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.

Note: The firewall does not significantly affect system performance, so we advise enabling the prevention features to protect your network.

To enable the firewall:

1. Select Enable.
   
   
2. Click SAVE SETTINGS. You can now configure your firewall options:
   • Access Control
   • MAC Filter
   • URL Blocking
   • Schedule Rule
   • Intrusion Detection
   • DMZ