Port Forwarding (Gateway Mode Only)
Special Applications
When the X-Modem is congured in gateway mode Network Address
Translation is enabled that prevents incoming connections from the
Internet entering the local network. This is usually a desirable situation as
it provides a basic rewall facility to protect the network. However some
special applications may require that an incoming connection is allowed.
The Port Forwarding option allows selection of a special port to be
redirected from the modem to a specied IP address. The example shows
how to forward port 25 the standard smtp port to a computer with the
IP address 10.0.0.25 20 Special ports can be added to the port forward
screen.
To add a port simply ll out the boxes.
Public Port Start: The rst port number that the external client will be
connecting to, to access the service.
Public Port End: The last number that the external client will be
connecting to, to access the service. Where a single port is required the
Start and End port numbers are the same.
Private Port: The port number that the service is running on, on the local
machine. Usually both Public & Private ports are the same.
Port Type: Set the required type of port, usually TCP.
Host IP Address: IP address of local computer hosting service.
Note: When using port forwarding rules it is advisable to manually
congure the TCP-IP settings on the host computer rather than rely on
DHCP to ensure that the IP address always remains the same.