Billion BiPAC 7300 RA User Manual page 71

Firewall: Prevents access from outside your network.
NAT natural firewall: This masks LAN users' IP addresses, which are invisible to outside
users on the Internet, making it much more difficult for a hacker to target a machine on your
network. This natural firewall is on when the NAT function is enabled.
When using Virtual Servers (port mapping) your PCs are exposed to the
ports specified opened in your firewall packet filter settings.
Firewall Security and Policy (General Settings): Inbound direction of Packet Filter rules
prevent unauthorized computers or applications accessing your local network from the
Internet.
Intrusion Detection: Enable Intrusion Detection to detect, prevent, and log malicious
attacks.
MAC Filter rules: Prevents unauthorized computers accessing the Internet.
URL Filter: Blocks PCs on your local network from unwanted websites.
A detailed explanation of each of the following five items appears in the Firewall section
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