how to find out through what the "NAT + PROXY" function does

[msibyte]

function "https://ibb.co/F3frVHw " the function works for TCP ports too, not just http. what programs will be needed to do the same?
so what utility does he use for this?
I just want to do the same on OPNsense, only in OPNsense there was no such setting in the NAT port forward section

[SteveITS]

@msibyte https://docs.netgate.com/pfsense/en/latest/nat/reflection.html
"NAT reflection refers to the ability to access external services from the internal network using the external (usually public) IP address, the same as if the client were on the Internet."

NAT + Proxy is one method to do this. It has nothing to do with access from the Internet, that is just plain old NAT.