NGINX domain name forwarding?

Question

Nginx

Guys please help, this is the second time I'm asking a similar question, but now I'll put everything on the shelves:
There is an external IP and several internal IPs on different servers. Sites weigh on internal IPs and there are 2 domain names ocdod74.ddns.net and ocdod174.ddns.net and each domain is configured to an external IP ( 80.255.90.162) server) so that he could recognize domains and redirect to the corresponding external IP?

I need: I go
to the ocdod74.ddns.net domain I get to a site whose internal IP is 10.102.10.32 I
go to the ocdod174.ddns.net domain I get to a site whose internal IP is 10.102.10.70
and that everything was on port 80


When I go to the GNIX config on 10.102.10.32, there are 2 files and this is what is written there:

bigbluebutton

server {
listen      10.102.10.32:80;
    server_name ocdod74.ddns.net;



     access_log  /var/log/nginx/bigbluebutton.access.log;

         # Handle RTMPT (RTMP Tunneling).  Forwards requests
         # to Red5 on port 5080
      location ~ (/open/|/close/|/idle/|/send/|/fcs/) {
          proxy_pass         http://127.0.0.1:5080;
          proxy_redirect     off;
          proxy_set_header   X-Forwarded-For   $proxy_add_x_forwarded_for;

          client_max_body_size       10m;
          client_body_buffer_size    128k;

          proxy_connect_timeout      90;
          proxy_send_timeout         90;
          proxy_read_timeout         90;

          proxy_buffering            off;
          keepalive_requests         1000000000;
      }

         # Handle desktop sharing tunneling.  Forwards
         # requests to Red5 on port 5080.
       location /deskshare {
           proxy_pass         http://127.0.0.1:5080;
           proxy_redirect     default;
           proxy_set_header   X-Forwarded-For   $proxy_add_x_forwarded_for;
           client_max_body_size       10m;
           client_body_buffer_size    128k;
           proxy_connect_timeout      90;
           proxy_send_timeout         90;
           proxy_read_timeout         90;
           proxy_buffer_size          4k;
           proxy_buffers              4 32k;
           proxy_busy_buffers_size    64k;
           proxy_temp_file_write_size 64k;
           include    fastcgi_params;
       }

        # BigBlueButton landing page.
        location / {
          root   /var/www/bigbluebutton-default;
          index  index.html index.htm;
          expires 1m;
        }

        # Include specific rules for record and playback
        include /etc/bigbluebutton/nginx/*.nginx;

        #error_page  404  /404.html;

        # Redirect server error pages to the static page /50x.html
        #
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
                root   /var/www/nginx-default;
        }
}

default

# You may add here your
# server {
#       ...
# }
# statements for each of your virtual hosts to this file

##
# You should look at the following URL's in order to grasp a solid understanding
# of Nginx configuration files in order to fully unleash the power of Nginx.
# http://wiki.nginx.org/Pitfalls
# http://wiki.nginx.org/QuickStart
# http://wiki.nginx.org/Configuration
#
# Generally, you will want to move this file somewhere, and start with a clean
# file but keep this around for reference. Or just disable in sites-enabled.
#
# Please see /usr/share/doc/nginx-doc/examples/ for more detailed examples.
##


server {
listen 10.102.10.32:80 default_server;
server_name ocdod74.ddns.net;

        root /usr/share/nginx/html;
        index index.html index.htm;

        # Make site accessible from http://localhost/
        server_name localhost;

        location / {
                # First attempt to serve request as file, then
                # as directory, then fall back to displaying a 404.
                try_files $uri $uri/ =404;
                # Uncomment to enable naxsi on this location
                # include /etc/nginx/naxsi.rules
        }

        # Only for nginx-naxsi used with nginx-naxsi-ui : process denied requests
#location /RequestDenied {
        #       proxy_pass http://127.0.0.1:8080;
        #}

        #error_page 404 /404.html;

        # redirect server error pages to the static page /50x.html
        #
        #error_page 500 502 503 504 /50x.html;
        #location = /50x.html {
        #       root /usr/share/nginx/html;
        #}

        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
        #
        #location ~ \.php$ {
        #       fastcgi_split_path_info ^(.+\.php)(/.+)$;
        #       # NOTE: You should have "cgi.fix_pathinfo = 0;" in php.ini
        #
        #       # With php5-cgi alone:
        #       fastcgi_pass 127.0.0.1:9000;
        #       # With php5-fpm:
        #       fastcgi_pass unix:/var/run/php5-fpm.sock;
        #       fastcgi_index index.php;
        #       include fastcgi_params;
        #}

        # deny access to .htaccess files, if Apache's document root
        # concurs with nginx's one
        #
        #location ~ /\.ht {
        #       deny all;
        #}
}


# another virtual host using mix of IP-, name-, and port-based configuration
#
#server {
#       listen 8000;
1#      listen 8000;
#       listen somename:8080;
#       server_name somename alias another.alias;
#       root html;
#       index index.html index.htm;
#
#       location / {
#               try_files $uri $uri/ =404;
#       }
#}


# HTTPS server
#
#server {
#       listen 443;
#       server_name localhost;
#
#       root html;
#       index index.html index.htm;
#
#       ssl on;
#       ssl_certificate cert.pem;
#       ssl_certificate_key cert.key;
#
#       ssl_session_timeout 5m;
#
#       ssl_protocols SSLv3 TLSv1 TLSv1.1 TLSv1.2;
#       ssl_ciphers "HIGH:!aNULL:!MD5 or HIGH:!aNULL:!MD5:!3DES";
#       ssl_prefer_server_ciphers on;
#
#       location / {
#               try_files $uri $uri/ =404;
#       }
#}

I beg you to help me, I have already climbed the entire Internet, I am a teapot, nothing is clear at all. Many thanks in advance to everyone.

Answer 1

When I go to the GNIX config on 192.168.0.2, there are 2 files and this is what is written there:

You do not agree or do not understand something and write incomplete information.
Where is the server (192.168.0.2) in your picture?
Where did you get the nginx config from, from which server? In my opinion, this is a config from the virtual server server 10.102.10.32, because its IP appears.
You have a router in the picture, if I understand correctly, it is he who receives the external dynamic IP from the provider and ddns on it.
Then the question is: What are the rules for redirecting connections to port 80 on this router?