Port Forwarding Actiontech PK5000

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What is the difference between these two sections?

  The first one seems obvious, but the second throws me

Actiontek pk5000
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Paul MacDonaldConnect With a Mentor Director, Information SystemsCommented:
Say you wanted to accept RDP traffic to a node on the local network only from a specific remote machine.

Starting port: 0
Ending port: 65535
Protocol: TCP
LAN IP: whatever the local machine IP is

Starting port: 3389
Ending port: 3389
Remote IP: whatever the remote machine IP is

So now, traffic on port 3389 is accepted ONLY if it's from a specific remote computer.  And that traffic is directed to a specific machine.  I can't imagine very many instances where you'd want to do something like that, but the example I gave is one.
Paul MacDonaldDirector, Information SystemsCommented:
1. should be where the traffic is going to.
2. should be where the traffic is coming from.
13yearsAuthor Commented:
The first one I can see a simple example, I want to forward port 25 to a SMTP server

Where would I use the second option?
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Paul MacDonaldDirector, Information SystemsCommented:
Oh, yes, well I don't think you typically would.  It's there if you want to, say, allow Remote Desktop traffic from only a certain IP address.  That way, no one can leverage the port forwarding for their own purposes.
For #2 leave the ports as is (all of them)
Set the IP to (any address)
13yearsAuthor Commented:
I guess I don't see it.   How would that only allow remote traffice from a certain IP?

I figure you could the same with the top section
13yearsAuthor Commented:
would the second option be used, if I wanted to remote in from maybe my work connection?
kdearingConnect With a Mentor Commented:
For example:

You want to use Remote Desktop to access your home computer

In section 1
  start port                 3389
  end port                  3389
  protocol                   TCP
  LAN IP address (your home computer local IP address)

Section 2 is used to define the remote source
  You don't know what the source ports will be because the computer pick a random source port, usually above 49152
  If you just want to be able to access you home computer only from work, then the remote IP is your work's public IP address

  start port                       0
  end port                        65535
  remote IP address        use to access your home computer from anywhere on the internet
13yearsAuthor Commented:
That make sense.  

kdearing the example you gave makes perfect sense.  

After reading that  paulmacd explination makes sense now.

Thank you very much for the explination
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