The Forwarding Rules menu gives you the following options:
The Broadband Router with USB Print Server's NAT firewall filters out unrecognised packets to protect your local network. All computers behind the firewall are invisible externally. You can make some of them accessible by enabling them in the Virtual Server's map. The Virtual Server function is also known as port forwarding.
Virtual Server sets up public services on your network. When an external Internet user makes a request to a specific port in your network, the router will forward that request to the appropriate computer. The computer must be configured with a static IP address in order to be recognised by the Virtual Server. A virtual server is defined as an IP address and a service port, and all requests to this port will be redirected to the computer associated with this port in the Virtual Server.
For example, if you have an FTP server (port 21) at 192.168.123.1, a Web server (port 80) at 192.168.123.2, and a VPN server (port 1723) at 192.168.123.6, then you need to specify the following virtual server mapping table:
|Service Port||Server IP||Enable|
To add a service using Virtual Server, perform the following steps:
Select an item from Well known services, select a unique ID number, and click Copy to.
Follow steps 1–3 above for additional services as needed.
Virtual Server can work with schedule rules, giving you more flexibility in access control. To associate a schedule rule with a virtual server ID line:
For more information about schedule rules, see Schedule Rule under Security Settings in this guide.
To establish an open service port for external applications, perform the following steps:
Select an item from the Popular applications list box, select a unique ID number, and click Copy to.
To specify multiples, use a comma as a separator. To specify a range, use a hyphen between the first and last port number in the range. These rules are illustrated in the following table:
|Incoming Ports specification|
|range of ports||10000-11000|
|multiple ranges of ports||10000-11000,13000-15000|
Note: Only one computer can use a given special application port at a time.
If you establish a special application port but the application still does not function correctly, consider specifying a DMZ host.
A DMZ (Demilitarised Zone) host is a computer without the protection of the firewall. The DMZ feature allows a computer to be exposed to unrestricted two-way communications for Internet games, video conferencing, Internet telephony and other special applications. Use this feature only when necessary.
Use this option to enable access to an FTP server whose port number is not 21.