Port forwarding specifying target/source ports
In port forwarding, how can you specify the target port.
For example, say I'm running a web server on a laptop that serves at port 8888, and that laptop's local IP is something like 10.0.0.31. My main question is how can I make that accessible from outside the LAN (just temporarily for a day or something). I tried specifying a port forward to the laptop and specifying (example) port 8888, but navigating to
Let's say I want to forward traffic that comes in to my router at port 9999 and forward it to that laptop at port 8888. How can this be done if at all?