Port Triggering Question

[BlackBeanie]

I am learning to set up port triggering for a prog. In the router's config. menu it asks for the trigger port. I know that for the destination ports I should put in the ports that the prog. uses. How about the trigger port? A co-workers says it doesn't matter. Just put in whatever. Is that right?

[Tuttle]

You probably want port forwarding rather than port triggering.

Port forwarding says "always accept traffic on port n and forward it to machine x".

Port triggering says "when any machine connects out using port m, forward port n back to that machine for a while".

In the port triggering case, the trigger port is m and the destination port is n.

[BlackBeanie]

You probably want port forwarding rather than port triggering.

Port forwarding says "always accept traffic on port n and forward it to machine x".

Port triggering says "when any machine connects out using port m, forward port n back to that machine for a while".

In the port triggering case, the trigger port is m and the destination port is n.

I know. I am just trying to learn how to do it. I have done the port forwarding way and now I just want to know how to do it the port triggering way.
Back to my question, what should I put in the for trigger port? My co-worker says it doesn't matter. He says I can put in any port # for that. Is that right? And if that's right, how would the software know that's the port to use to send out requests?

[SpywareDr]

Wikipedia > Port triggering
http://en.wikipedia.org/wiki/Port_triggering

dslreports.com > INFO: Port Triggering - What is it?
or...
Everything You Always Wanted to Know About Port Triggering But Were Afraid To Ask...
http://www.dslreports.com/forum/rema...p,16;mode=flat

[BlackBeanie]

Thank you for the links but they don't answer my question.

[Tuttle]

The trigger port depends on the application. Whatever that application is built/configured to use outbound is what you need to teach the firewall to deal with.

[BlackBeanie]

Thank you.