User Manual Part 2

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MAC Filtering
When you enable the MAC Filtering function, you can specify the MAC
Addresses in current filter table. Once the source MAC Address of outgoing
packets match the MAC Addresses in the table, the firewall will block this
packet from LAN to WAN.
Configuring Port Forwarding (Virtual ʳ Server)
This function allows you to automatically redirect common network
services to a specific machine behind the NAT firewall. These settings are
only necessary if you wish to host some sort of server like a web server or
mail server on the private local network behind the device's NAT firewall.