> I am trying to do port fowarding and it asks me what it is
> [...] Is there some actual problem which you are trying to solve?
Still a mystery. _Why_ are you "trying to do port fowarding"? Which
ports are you trying to forward, and to what? Why?
The external port numbers are the ones which a client in the outside
world would use to talk to some server system on your LAN. The internal
ports are the ports on that server system where your server program
would be listening. The server program determines to which ports it
listens. You determine which external ports the router should map onto
those internal ports.
I assume that that explanation is not helpful, but, without some idea
of what you're really trying to do, it's hard to provide any useful
information.
