Operation Manual

The Outpost Log System
69
checks for rules matching the activity of the application in the Global Application and
System Rules list and uses any that might apply.
5.5 System Level Filtering
Open the Options dialog window and select the System tab:
Note: These settings are for advanced users only. If any are incorrectly changed for your
system or network, it could result in your firewall not working as expected.
The following options are available:
LAN settings—lets you change the settings for your local area network, your NetBIOS
choices, and lets you add or remove trusted IP ranges. NetBIOS is what Windows uses as
the protocol for transferring shared files between computers and/or printers on a network.
NetBIOS is useful on a LAN with trusted computers but it can leave your computer open
to attack if it is allowed for general Internet connections. To learn more about
configuring your LAN settings, refer to
5.6 Settings for a Home or Office Network.
ICMP—lets you specify the types and directions of the ICMP messages allowed. The
different types of ICMP messages are listed in
Appendix B: Types of ICMP Messages. It is
recommended that you do not change the ICMP settings unless you are certain that you are
making the right changes. The Default button on the ICMP settings dialog resets all the
ICMP settings to what they were when Outpost Firewall was first installed.
Firewall mode—to switch stealth mode on or off. Normally, when your computer
receives a connection request from another computer it lets the other computer know that
this port is closed. In stealth mode, your computer will not respond, making it seem like it