Askey Computer Corp RTW030 User Manual
44
Forwarding
The Broadband Home Router implements NAT to let your entire local network appear as a
single machine to the Internet. The typical situation is that you have local servers for different
services and you want to make them publicly accessible. With NAT applied, it will translate
the internal IP addresses of these servers to a single IP address that is unique on the Internet.
NAT function not only eliminates the need for multiple public IP addresses but also provides
a measure of security for your LAN.
When the router receives an incoming IP packet requesting for access to your local server, the
router will recognize the service type according to the port number in this packet (e.g., port 80
indicates HTTP service and port 21 indicates FTP service). By specifying the port number,
you tell the router which service should be forwarded to the local IP address you specify.
Protocol: Select a protocol type used by the service that will be forwarded.
TCP/IP Port: The Broadband Home Router supports port mapping function which translates
a standard port number to a non-standard number. Incoming data packets sent to a specific IP
port can be mapped to the port you specify. The most often used port numbers include:
21 (FTP ), 80 (HTTP), 23 (Telnet) and 25(SMTP)
IP Address: Specify the internal IP address to which the packets are forwarded to.
How to configure port forwarding:
1. Select the protocol type from the drop-down list.
2. Select a service in TCP /IP Port field and enter the port number you want to use.
3. Enter the IP address of the local server in the IP Address filed.
4. Click Apply button to commit the setting.
If you are going to delete a forward entry, select it from the status filed to delete it.