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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.
IP Filtering
When you enable the IP Filtering function, you can specify local IP
Addresses in current filter table. If you select ACCEPT for the IP
forwarding default policy, once the source IP address of outgoing packets
match the IP address definition in the table, the firewall will block those
packets form LAN to WAN.