ZyXEL VFG6005 User Guide - Page 65

CHAPTER8 APPLICATIONS SETTINGS 8.1 PORT RANGE FORWARD SETUP By activating the port range forwarding function, remote users can access the local network via the public IP address. Users can assign a specific external port range to a local server. Furthermore, users can specify an internal port range associated in a port range forwarding rule. When the ZyXEL VFG6005 Series VPN Firewall Gateway receives an external request to access any one of the configured external ports, it will redirect the request to the corresponding internal server and change its destination port to one of the internal ports specified. Therefore, if users do not wish for destination port to be changed for a request, the internal port range should be left empty. Certain applications in a LAN are available only after activating the port range forwarding, including servers and online gaming. When an Internet request wants to access a port, the ZyXEL VFG6005 Series VPN Firewall Gateway will dispatch it to the IP specified. Due to security reasons, users are suggested to limit the use of port range forwarding, and cancel it when the application is not used. By enabling DMZ Host Function, you can set up a DMZ host at a particular computer exposed to the Internet. In this way, some applications, especially online games (if the traffic port numbers of the applications are always changing), can be easily accessed. 56