Cisco Systems RV325K9NA, RV320K9NA manual General, Enabling Firewall Features

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Firewall

The primary objective of a firewall is to control the incoming and outgoing network traffic by analyzing the data packets and determining whether it should be allowed through or not, based on a predetermined rule set. A network firewall builds a bridge between an internal network that is assumed to be secure and trusted and another network, usually an external (inter)network such as the Internet that is assumed not to be secure and untrusted.

General

General firewall controls manage the features typically used by Internet browsers and applications.

To open this page, select Firewall > General in the navigation tree.

Enabling Firewall Features

To enable the Firewall, check Enable. The following firewall features can be enabled or disabled as needed:

•SPI (Stateful Packet Inspection)—Monitors the state of network connections (such as TCP streams, UDP communication) traveling across it. The firewall distinguishes legitimate packets for different types of connections. Only packets matching a known active connection are allowed by the firewall; others are rejected.

•DoS (Denial-of-service)—Detects attempts to cause a server overload. In general terms, DoS attacks are implemented by either forcing the targeted computer(s) to reset, or consuming its resources so that it can no longer provide its intended service or obstructing the communication media between the intended users and the victim so that they can no longer communicate adequately.

•Block WAN Request—Drops TCP requests and ICMP packets.

Cisco Small Business RV320/RV325 Administration Guide 75