network, such as Web servers, FTP servers, e-mail servers and other specialized Internet applications (for example, videoconferencing or online gaming). When users send this type of request to your network via the Internet, the router will forward the request to the appropriate PC.
Enabled: Select to enable/disable the function.
Comment: Enter any description of the current mapping rules.
Server IP: Enter the server IP address.
Mapping Ports: Select either a protocol from the drop-down menu and enter the mapping ports.
Add/Modify: Click to add/edit rules you’ve configured.
3.5.4 Passthrough
VPN: Some applications require an application-level gateway through the router. You can select any of the three “passthroughs” here: “Point-to-Point Tunneling Protocol”; “IPSec,” or Internet Protocol Security, which is a suite of protocols used to implement secure exchanges; and “Layer 2 Tunneling Protocol.”
FTP / Non-Standard FTP Port: If the FTP server is using a non- standard FTP port number, this can prevent FTP data connections
