Nlynx Wireless LAN Device Series ZWA-G120 - Manual (Page 44)

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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
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.
The most often used port numbers are shown in the following table.
Services Port Number
ECHO 7
FTP (File Transfer Protocol)
21
Telnet 23
SMTP (Simple Mail Transfer Protocol)
25
DNS (Domain Name System) 53
Finger 79
HTTP (Hyper Text Transfer Protocol)
80