|The port number you are associating with the device using is the number you are forwarding to to. The port you are forwarding from is determined by the originator of whatever you are trying to forward.. They are both usually the same but can be different depending on the configuration of the server that you are port forwarding to.|
Port forwarding is not used for stealth purposes. In fact port forwarding will drive a hole through any stealth facilities you may have set up. The purpose of port forwarding is to allow the router to handle unsolicited packets. Normally a routers firewall will reject any unsolicited packets and only allow solicited packets through such as HTTP requests. This is needed if you are running any kind of server that needs to respond to requests from outside your LAN.
If you want to stealth your LAN you configure the firewall to ignore any UDP requests. UDP packets are used by the Ping commands if your router is ignoring ping commands it is effectively stealthed. You cannot stealth your system and have port forwarding in operation at the same time. If you have port forwarding in operation there will always be at least one port open and able to respond to outside requests. That is its purpose.
message edited by StuartS