User manual

Conguring Security Settings

6.6 Port Triggering

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6.6 Port Triggering

Port triggering can be described as dynamic port forwarding. By setting port

triggering rules, inbound traffic will be allowed to arrive at a specific network

host using ports different than those used for outbound traffic. When using port

triggering, the outbound traffic triggers the ports at which inbound traffic

is directed.

For example, a gaming server is accessed using UDP protocol on port 2222. The

gaming server then responds by connecting the user using UDP on port 3333

when a gaming session is initiated. In this case, port triggering must be used,

since it conflicts with the following default firewall settings:

The firewall blocks inbound traffic by default. t

The server replies to the FiOS Router’s IP, and the connection is not sent back t

to the host, since it is not part of a session.

To resolve the conflict, a port triggering entry must be defined, which allows

inbound traffic on UDP port 3333 only after a network host generated traffic to

UDP port 2222. This results in the FiOS Router accepting the inbound traffic from

the gaming server, and sending it back to the network host which originated

the outgoing traffic to UDP port 2222.

To configure port triggering:

Select 1. Port Triggering from the left side of any Security screen. The “Port

Triggering” screen appears.

Select either “User Defined” or “Show All Services” from the drop-down list 2.

next to “Add.”