Edit or delete a port forwarding entry, Set up port triggering – On Networks N300RM User Manual User Manual
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Security Settings
56
N300 WiFi ADSL2+ Modem Router (N300RM)
Edit or Delete a Port Forwarding Entry
To edit or delete a port forwarding entry:
1.
In the table, select the radio button next to the service name.
2.
Click Edit Service or Delete Service.
Application Example: Making a Local Web Server Public
If you host a web server on your local network, you can use port forwarding to allow web
requests from anyone on the Internet to reach your web server.
To make a local web server public:
1.
Assign your web server either a fixed IP address or a dynamic IP address using DHCP
address reservation. In this example, your modem router always gives your web server
an IP address of 192.168.0.33.
2.
In the Port Forwarding/Port Triggering screen, configure the modem router to forward the
HTTP service to the local address of your web server at 192.168.0.33. HTTP (port 80) is the
standard protocol for web servers.
3.
(Optional.) Register a host name with a Dynamic DNS service, and configure your modem
router to use the name as described in
75. To access your web
server from the Internet, a remote user has to know the IP address that your ISP assigned.
However, if you use a Dynamic DNS service, the remote user can reach your server by a
user-friendly Internet name, such as mynetwork.dyndns.org.
Set Up Port Triggering
Port triggering is a dynamic extension of port forwarding that is useful in these cases:
•
More than one local computer needs port forwarding for the same application (but not
simultaneously).
•
An application needs to open incoming ports that are different from the outgoing port.
When port triggering is enabled, the modem router monitors outbound traffic looking for a
specified outbound “trigger” port. When the modem router detects outbound traffic on that
port, it remembers the IP address of the local computer that sent the data. The modem router
then temporarily opens the specified incoming port or ports, and forwards incoming traffic on
the triggered ports to the triggering computer.
Port forwarding creates a static mapping of a port number or range to a single local
computer. Port triggering can dynamically open ports to any computer that needs them and
can close the ports when they are no longer needed.