Port Triggering - Cox Business 4131 User Manual

Figure 34: Port Forward Table Settings
On this screen, you can select the range of ports and the types of traffic to be forwarded to an
IP address. The range information can be configured in Start Port and End Port fields. You
can select either TCP traffic alone or UDP traffic alone or both.
The Server IP should be the IP address of the target device. In the example above (Figure 34),
the 4131 is configured to forward TCP traffic on ports 2-20 to IP address 192.168.0.10.
The enable button enables the port forwarding feature; the entries can be deleted from the
table clicking the X in the Delete column.

Port triggering

Port triggering allows you to define a set of dynamic port forwarding rules that will be activated
as soon as a device sends traffic to the Internet over a specific port(s), the trigger port(s).
The difference compared to the port forwarding function described in Getting Started is that:
•
Port triggering rules will only be activated if a local device is sending traffic over one of
the trigger ports. There must be outbound traffic first.
•
Port triggering rules forward the traffic to any device that has initiated the communication
while port forwarding only forwards to a specific fixed IP.
•
Port triggering rules allow you to translate the port numbers. This means that the
incoming port can differ from the target port.
•
If no outgoing traffic is detected on the Trigger Range ports for 10 minutes, the Target
Range ports will close.
This is a safer method for opening specific ports for special applications such as, video
conferencing programs, interactive gaming, file transfer in chat programs, etc. They are
dynamically triggered and not held open constantly or erroneously left open via the router
administrator and exposed for potential hackers to discover.
CGA4131 Business Gateway Setup and User Guide
Advanced Configuration
44