Enable. Check the Enable box to enable the services you have defined. Port Range Forwarding will not function if the Enabled button is left unchecked. This is disabled (unchecked) by default.
When you have finished making changes to this screen, click the Save Settings button to save the changes, or click the Cancel Changes button to undo your changes. Help information is shown on the right-hand side of a screen. For additional information, click More.
The Applications & Gaming Tab - Port Triggering
The Port Triggering screen allows the Router to watch outgoing data for specific port numbers. The IP address of the computer that sends the matching data is remembered by the Router, so that when the requested data returns through the Router, the data is pulled back to the proper computer by way of IP address and port mapping rules.
Port Triggering
Application. Enter the application name of the trigger. Triggered Range
For each application, list the triggered port number range. Check with the Internet application documentation for the port number(s) needed.
Start Port. Enter the starting port number of the Triggered Range.
Chapter 5: Configuring the Router
The Applications & Gaming Tab - Port Triggering
IP Address. Enter the IP address of the server that you want the Internet users to be able to access. To find the IP address, go to “Appendix C: Finding the MAC Address and IP Address for Your Ethernet Adapter.”
Protocol. Select the protocol TCP or UDP, or select Both.

Wireless-G Broadband Router with 2 Phone Ports tcp: a network protocol for transmitting data that requires acknowledgement from the recipient of data sent.

udp: a network protocol for transmitting data that does not require acknowledgement from the recipient of the data that is sent.

ip (internet protocol): a protocol used to send data over a network.

ip address: the address used to identify a computer or device on a network.

Figure 5-26: Applications & Gaming Tab -

Port Triggering

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Linksys WRT54GP2 manual Applications & Gaming Tab Port Triggering