Motorola MG8702 User Manual page 35

Review your game or device documentation to find the port or ports
that need to be forwarded. Also, determine the IP Address that your
device is using. Your game or device documentation should show you
where to find this information.
You can create Port Forwarding Rules to support the requirements of
your game or device. Your game or device may need more than one
port to be forwarded. In some cases, the ports will be numbered
sequentially, in a range. These can be specified in a single Port
Forwarding rule. In other cases, the ports may be separated. In this
case, you will have to set up a separate forwarding rule for each port.