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Chapter 3 Configuration
35
Firewall Security: When you enable the Firewall security function, you can select one
of the firewall security policies. By default the firewall is set to disabled.
Firewall Policy: Select either All blocked/User-defined, High, Medium or Low security
level to enable the Firewall. The different among these three security levels is the pre-
setting of port filter rules in the Packet Filter.
All blocked/User-defined: no pre-defined port or address filter rule by default, it
means all inbound (Internet to LAN) and outbound (LAN to Internet) packets will
be blocked. Users have to add their own filter rules for further access to the
Internet.
High, Medium and Low security level: By default, your system uses High,
Medium and Low firewall security levels between the WAN and LAN. For
example, when you select High, the Port Filters of the Packet Filter screen will be
set automatically according to High security level settings.
Firewall Logging: When both the Firewall Security and Firewall Logging are enabled,
the device will detect the blocked and/or intrusion packets, once the setting has been
configured. Then the router will log the corresponding (blocking or intrusion detection)
logs into the Event Log under Status.
Select the Apply button to save the setting.
Please note that the enabling of Firewall Security & selection of Firewall policy is belong
to the second level of Firewall as described above, it blocks and redirects certain ports
to limit the services that outside users can access with Port and Address Filter features.
Please refer to Intrusion Detection section for security level 3 protection - to prevent
your local area network (LAN) from malicious attacks, for example, port scan and
Denial-of-Service (DoS).