In some situations, it may be necessary to map ports for a particular IP address, so that traffic arriving on the PIX Firewall for port X is translated to the inside address with port Y. For example, the outside world may want to connect to port 80 (HTTP) of a Web server. However, the device has designated port 8000 for HTTP. In this case, the PIX would translate incoming port 80 traffic to port 8000 before sending it out the inside interface.
On the PIX Device Manager (PDM), click on Configuration > Translation Rules.
To configure port forwarding, perform the following steps:
Right click in the middle gray pane and select Add.
In the Original Host/Network pane, select the Inside Interface, and input the IP address and subnet mask of the host.
In the Translate Address to pane, select the radio button named Static.
Select the IP address as the Interface IP, or type the new (public) IP address (if desired).
Click the Redirect Port check box.
Select the UDP or TCP option, depending on the service or port to be translated.
Provide the Selected Port and the Translated Port.