Possibly, I did not explain myself well. That configuration there works fine for external users accessing the external IP 188.8.131.52.
What I want to is to make possible for the INSIDE/internal users to access that server with the EXTERNAL ip 184.108.40.206 . Users in the INSIDE zone can acccess host by internal ip 192.168.1.1 . I want them to access it by External IP.