Question about STUN, STUNT... You need to set up a connection through the NAT provider between the rat client and the server. How?

Question

Network administration

I have a gray ip, and I can’t do anything about it (Galimy nat doesn’t let me normally on the Internet, or rather, others can’t get through to me =( I found a list of stun servers, I think I found a client , but I didn’t understand how to use it, you can only check the connection with the stun server and that's it.In the rat settings, you can write only ip and port.