User Manual

Page 106
Configure Firewall
More than just a “NAT” firewall, there is a powerful Stateful Packet
Inspection (SPI) firewall option that can be activated on the router.
Stateful inspection compares certain key parts of the packet to a
database of trusted information before allowing it through.
Common hacker attacks like IP Spoofing, Port Scanning, Ping of Death
and SynFlood can be easily thwarted with the router’s SPI firewall.
The following steps explain the configuration of the router’s SPI firewall.
As incorrect configuration to the firewall can result in undesirable
network behavior, you are advised to carefully plan your firewall
security rules.
1. Under the SECURITY CONFIGURATION command menu, click on Firewall
Configuration.
2. First, enable the firewall. You can
choose among the Default Low,
Default Medium or Default High
security options for convenient
setup.
3. Then you may choose the type
of network activity information
you wish to log for reference.
Data activity arising from
different types of protocol can
be recorded.
The packet types that you have
selected in the Accepted section
will be displayed in the firewall
log if they are detected by the
firewall. This also applies to the
Denied section.
4. You may add more firewall rules
for specific security purposes.
Click on the Add radio button at
the screen shown above,
followed by the Edit button and
the screen on the left will
appear.