I have an nwsp2 connected to my fritzbox 7270. Now on the fritzbox I run an fhem (home automation) system. This system is acessible with the fitzbox's ip and port x on the the internal network. Fritzbox does not allow to open this port to the external network. But fritzbox allows to forward its ip with certain a port to an internal ip.
Now my question: Can I use the nwsp2 to redirect an incoming connection to another ip with another port ?
This way I could forward the incoming connection back to fritzbox. And if that was possible, could I allow this forwarding only with a user/password procedure?