32
Ch 4. Advanced Configurations
Configuring LAN to WAN Firewall
Filtering function is used to block or permit packets from LAN to WAN. The
device supports three kinds of filter Port Filtering, IP Filtering and MAC
Filtering. All the entries in current filter table are used to restrict or allow
certain types of packets from your local network to through the device. Use
of such filters can be helpful in securing or restricting your local network.
Denied or Allowed list depends on your IP forwarding default policy in Route
page. The IP forwarding default policy is “Accept”.
If you want to block some application from LAN to WAN, you can go to the
“Firewall” page, then “NAT” and select “Drop” for IP Forwarding Default
Policy. Then go to the Port filtering, IP Filtering, MAC Filtering page option to
edit the permit list.
Port Filtering
When you enable the Port Filtering function, you can specify a single port
or port ranges in current filter table. If you select “Accept” for the IP
forwarding default policy, once the source port of outgoing packets match
the port definition or within the port ranges in the table, the firewall will
block those packets form LAN to WAN.
If you select “Drop” for the IP forwarding default policy, once the source
port of outgoing packets match the port definition or within the port ranges
in the table, the firewall will allow those packets form LAN to WAN.
