Set Up Port Triggering - NETGEAR CG3300CMR User Manual

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:
Assign your web server either a fixed IP address or a dynamic IP address using DHCP
1.
address reservation. In this example, your gateway always gives your web server an IP
address of 192.168.1.33.
In the Port Forwarding/Port Triggering screen, configure the gateway to forward the HTTP
2.
service to the local address of your web server at 192.168.1.33. HTTP (port 80) is the
standard protocol for web servers.
(Optional) Register a host name with a Dynamic DNS service, and configure your gateway
3.
to use the name as described in
the Internet, a remote user has to know the IP address that your ISP assigns. However, if
you use a Dynamic DNS service, the remote user can reach your server by a user-friendly
Internet name, such as mynetgear.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 opens incoming ports that are different from the outgoing port.
•
When port triggering is enabled, the gateway monitors outbound traffic looking for a specified
outbound "trigger" port. When the gateway detects outbound traffic on that port, it remembers
the IP address of the local computer that sent the data. The gateway then temporarily opens
the specified incoming port or ports, and forwards incoming traffic on the triggered ports to
the triggering computer.
While 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.
If you use applications such as multiplayer gaming, peer-to-peer
Note:
connections, real-time communications such as instant messaging,
or remote assistance (a feature in Windows XP), enable Universal
Plug and Play (UPnP) according to the instructions in
and Play
To set up port triggering, you need to know which inbound ports the application needs. Also,
you need to know the number of the outbound port that triggers the opening of the inbound
Wireless Cable Gateway CG3300CMR
Dynamic DNS
on page 70.
Advanced Settings
66
on page 68. To access your web server from
Universal Plug