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somewhereinafricaFlag for Haiti

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(Port range forwarding) Explain this simple router feature, what it does, and how i would use it

I'm trying to figure out "all the other" things about the routers, I just have never had a need to poke at these things.

In this image there is port forwarding, and range port forwarding, explain to me:

Why would I need to specify that 'all' communication on a certain port would need to go to a specific address, wouldn't the incoming packages know where they were going?

What application (except games) needs to have certain ports forwarded, I thought it was only firewalls that dealt with ports as far as open or close them. Why do I need to forward packages and why and what application needs this (real life example)

This might seem like a self explanatory feature at first glance, but i would like to know a little more about it (and not Google it). A few pointers would be highly appreciated.

I'm trying to understand the concept, not the specific feature in this specific router.
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maeltar
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aaahhhhhhh, if the incoming package was not initiated by someone on the LAN, how would the router know where on the network to send it.

THAT simple, I could just for the life of me not think outside the box on that one. Thank you oodles