YML-O-3G19W 3G WiFi Router User Guide
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NETCOMM LIBERTY™ SERIES - 3G WiFi Router
7.2 Network Address Translation (NAT)
7.2.1 Port Forwarding
Port Forwarding allows you to direct incoming trafc from the Internet side (identied by Protocol and External port) to the internal server
with a private IP address on the LAN side. The Internal port is required only if the external port needs to be converted to a different port
number used by the server on the LAN side. A maximum of 32 entries can be congured.
To add a Virtual Server, click the Add button. The following screen will display.
OPTION DESCRIPTION
Select a Service Select a predened service to port forward. Or
Custom Server Create a custom server and enter a name for it.
Server IP Address Enter the IP address for the server.
External Port Start Enter the starting external port number (when you select Custom Server). When a
predened service is selected the port ranges are automatically congured.
External Port End Enter the ending external port number (when you select Custom Server). When a
predened service is selected the port ranges are automatically congured.
Protocol User can select from: TCP, TCP/UDP or UDP.
Internal Port Start Enter the internal port starting number (when you select Custom Server). When a
predened service is selected the port ranges are automatically congured.
Internal Port End Enter the internal port ending number (when you select Custom Server). When a
predened service is selected the port ranges are automatically congured.
7.2.2 Port Triggering
Some applications require specic ports in the Router’s rewall to be open for access by remote parties. Port Triggering opens up the
‘Open Ports’ in the rewall when an application on the LAN initiates a TCP/UDP connection to a remote party using the ‘Triggering
Ports’. The Router allows the remote party from the WAN side to establish new connections back to the application on the LAN side
using the ‘Open Ports’. A maximum 32 entries can be congured.
