Using The Port Triggers Option - Ubee DDW365 User Manual

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5. Create Port Forwarding rules per port. A rule set up for port 53 works only for port 53.
A port can be used only by one program at a time.
Note
You can set up applications/services to listen on one internal port. External Internet
users who want to access that application, address it using an external port, such as
an Audio server. Internal Ports are the ports to which local servers listen. External
Ports are the ports that the cable modem listens to from the WAN.
The following screen shot shows Forwarding set up for an Xbox.
6.6

Using the Port Triggers Option

Port Triggers define dynamic triggers to specific devices on the LAN. This allows special
applications that require specific port numbers with bi-directional traffic to function
properly. Applications such as video conferencing, voice, gaming, and some messaging
program features may require these special settings.
Some services use a dedicated range of ports on the client side and a dedicated range of
ports on the server side. The difference between port forwarding and triggering is:
 Port forwarding sets a rule to send a service to a single LAN IP address.
 Port triggering defines two kinds of ports: trigger port and target port. The trigger
port sends a service request from a LAN host to a specific destination port number.
The port the LAN host is required to listen to by the application is called the target
port. The server returns responses to these ports.
For example:
1. John requests a file from the Real Audio server (port 7070). Port 7070 is a "trigger"
port and causes the device to record John's computer IP address. The DDW365
associates John's computer IP address with the "target" port range of 6970-7170.
Ubee DDW365 Wireless Cable Modem Subscriber User Guide • October 2013

Using the Port Triggers Option

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