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4.3.3 Session Limit
A PC with private IP address can access to the Internet via NAT router. The router will generate the records of NAT sessions for such connection. The P2P (Peer to Peer) applications (e.g., BitTorrent) always need many sessions for procession and also they will occupy over resources which might result in important accesses impacted. To solve the problem, you can use limit session to limit the session procession for specified Hosts.
Please define the available session number for the router. If you do not set the session number in this field, the system will use the default session limit (25000) for the specific limitation.
4.4 Firewall
Basics for Firewall
While the broadband users demand more bandwidth for multimedia, interactive applications, or distance learning, security has been always the most concerned. The firewall of the Vigor router helps to protect your local network against attack from unauthorized outsiders. It also restricts users in the local network from accessing the Internet. Furthermore, it can filter out specific packets that trigger the router to build an unwanted outgoing connection.
Denial of Service (DoS) Defense
The DoS Defense functionality helps you to detect and mitigate the DoS attack. The attacks are usually categorized into two types, the
The DoS Defense function enables the Vigor router to inspect every incoming packet based on the attack signature database. Any malicious packet that might duplicate itself to paralyze the host in the secure LAN will be strictly blocked and a Syslog message will be sent as warning, if you set up Syslog server.
Also the Vigor router monitors the traffic. Any abnormal traffic flow violating the
Below shows the menu items for Firewall.
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