NETGEAR CG814M manual To configure Port Triggering

Reference Manual for the Model CG814M Wireless Cable Modem Gateway

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Port Triggering monitors outbound traffic. When the gateway detects traffic on the specified outbound port, it remembers the IP address of the computer that sent the data and “triggers” the incoming port. Incoming traffic on the triggered port is then forwarded to the triggering computer.

An example of Port Triggering for Internet Relay Chat (IRC) is shown in Figure 4-6. When you connect to an IRC server, the server tries to connect back on port 113 to do an Ident lookup. Unless you have configured Port Forwarding to open port 113, the traffic will be blocked. In this example, the initial login to the server in the range of ports 6660 to 6670 will be detected. This will trigger the gateway to temporarily forward port 113 to the PC that initiated the login.l

Figure 4-6: Port Triggering menu, with IRC example.

To configure Port Triggering:

4-10 Protecting Your Network