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How is a "trigger port" used in router?

By anjant ·
I am configuring a Belkin router in my SOHO for video conferencing. There is an area for "Special Applications Settings" that has following fields > TriggerPort TriggerType(TCP/UDP) PublicPort PortType(TCP/UDP) EnableCheckbox < . My application documents various ports that need to be open but it is not clear what is to be used for TriggerPort. Router manual examples 1 TriggerPort with many corresponding PublicPorts. I need to understand how an application uses TriggerPorts to communicate. Once I understand this, I am hopeful I will be able to read between lines in application documentation to understand what I need to setup my router. Thanks. >>Anjan>

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by CG IT In reply to How is a "trigger port" u ...

This in nothing more that Belkin using their own unique words for describing public and LAN ports. Confusing to the lay person but nonetheless a port is a port.

So with that, an application running on your computer that wishes to access the internet initiates or triggers an "outbound" request to the router. The router then sends along that request to the internet, if allowed, via rules or filters that you have setup. Same for "inbound" requests from the internet.

For instance, when you click on Internet Explorer, that action initiates or triggers an "outbound" request over port 80 [default port used for web pages] to the default web site you've chosen for your home page on Internet Explorer [like MSN or Yahoo or whatever]. Once the web site page if found it's sent to your computer as an "inbound" request over port 80. Provided you've allowed "inbound" traffic over port 80, Internet Explorer will display the requested page on your screen.

Various well known ports by RFC can be found by doing an internet search for the name well known ports. There are numerous sites which post what those ports are. Some common ones are: port 80 for HTTP [web pages]. port 21 for file transfer. port 25 for SMTP mail. port 110 for POP3 and so on.

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by anjant In reply to

Poster rated this answer.
The answer indeed cleared up my confusion and helped me with my work. The answer was clearly writen and easy to understand. Thank you.

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by anjant In reply to How is a "trigger port" u ...

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