Billion BiPAC 6200WZL R2, User Manual

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When using Virtual Servers (port mapping) your PCs are exposed to the
ports specified opened in your firewall packet filter settings.
Firewall and Access Control
Your router includes a full SPI (Stateful Packet Inspection) firewall for controlling Internet access from
your LAN, as well as helping to prevent attacks from hackers. In addition to this, when using NAT
(Network Address Translation) the router acts as a “natural” Internet firewall, since all PCs on your
LAN use private IP addresses that cannot be directly accessed from the Internet. See the
WAN
configuration section for more details on NAT.
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.