Specifications

80 Chapter 4. Configuring Special Features
Enable/Disable Internet Firewall Filtering
The router supports IP Internet Firewall Filtering to prevent unauthorized access to your system and network
resources from the Internet. This filter discards packets received from the WAN that have a source IP address
recognized as a local LAN address.
Caution: This is a simple firewall check; it does not add much security. For more elaborate firewall features, see
IP Filtering, page 119 .
You can control the Internet Firewall Filtering feature using the command:
eth ip firewall [on | off | list]
The Internet Firewall defaults to on during initial configuration, but it is active only when Ethernet LAN IP
routing is on.
As described earlier, Ethernet LAN IP routing is controlled by the commands:
eth ip enable
eth ip disable
Therefore, at initial configuration, to activate the Internet Firewall Filter, you need only enable IP routing. If you
do not wish the router to perform IP Internet Firewall Filtering while doing IP routing, you must turn off the
firewall filter. Remember to save and reboot if you alter the IP routing status.