Deliberant DLB2300, User Manual

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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