Aliasdomain in nginx

Hi, I searched a lot in forum but I don't found solution and I think it's simple.
I have a super perfect server with Ubuntu 14.04 and ISPConfig (i don't know where I can find version but i think is ..) 3.0.5.4p9 and nginx.
I have some main domains perfectly working and recently bought other domains. I want to make redirection for this domains to main domains and I can't figure how do this.
I have (example domain): www.maindomain.tld
I bougth: www.extradomain.tld
I need configure this redirections:
extradomain.tld -> www.extradomain.tld
www.extradomain.tld -> www.maindomain.tld

I was created a new aliasdomain with:

Aliasdomain: extradomain.tld
Parent Website: maindomain.tld
Redirect Type: (I don't know what value i need te choose, I tried some without good results)
Redirect Path:
Auto-Subdomain: www.
SEO Redirect: No Redirect

With this config if I write extradomain.tld in web browser shows page without redirection.
If I choose:
SEO Redirect: * => www.domain.tld

Don't do any redirection too
Any help? any point to the right direction?

Thanks

 

It is actually pretty simple.
Please refer : http://docs.ispconfig.org/creating-web-sites/alias-web-domains/

 

I'm asking because this docs don't work for me!!

This help that you send works bad. When I configure like docs and I write:
www.maindomain.tld
this redirect to:
www.extradomain.tld
And this extradomain just load page. This is working bad!

 

Sorry, i just write a bad rule in SEO Redirect,

This doc is incomplete. I don't know why isn't working for me. Just like docs ispconfig only add domains to server_name rule and no more.
Any help please?

 

Nope, you have to figure out the things,

What you have setup,

Try to setup

"R 301, L"

SEO redirect >> keep no redirect.

 

I'm using nginx, this settings don't work

 

Looking my vhosts files i see that some directives isn't in file:

Code:

server {
        listen *:80;
        server_name maindomain.tld www.maindomain.tld www.extradomain.tld extradomain.tld;
        root   /var/www/maindomain.tld/web;

        index index.html index.htm index.php index.cgi index.pl index.xhtml;

        error_log /var/log/ispconfig/httpd/maindomain.tld/error.log;
        access_log /var/log/ispconfig/httpd/maindomain.tld/access.log combined;

        location ~ /\. {
            deny all;
            access_log off;
            log_not_found off;
        }

        location = /favicon.ico {
            log_not_found off;
            access_log off;
        }

        location = /robots.txt {
            allow all;
            log_not_found off;
            access_log off;
        }

        location /stats/ {
            index index.html index.php;
            auth_basic "Members Only";
            auth_basic_user_file /var/www/clients/client1/web13/web/stats/.htpasswd_stats;
        }

        location ^~ /awstats-icon {
            alias /usr/share/awstats/icon;
        }

        location ~ \.php$ {
            try_files /84d221c80cd64cf4776db4b2cbff0ecc.htm @php;
        }

        location @php {
            try_files $uri =404;
            include /etc/nginx/fastcgi_params;
            fastcgi_pass 127.0.0.1:9022;
            fastcgi_index index.php;
            fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
            fastcgi_intercept_errors on;
        }

#own directives
        error_page 404 /404.html;

        gzip on;
            gzip_disable "msie6";
            gzip_vary on;
            gzip_proxied any;
            gzip_comp_level 6;
            gzip_buffers 16 8k;
            gzip_http_version 1.1;
            gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript;

        location ~* \.(?:jpg|jpeg|gif|png|ico|cur|gz|svg|svgz|mp4|ogg|ogv|webm|htc)$ {
          expires 1M;
          access_log off;
          add_header Cache-Control "public";
        }

        location ~* \.(?:ttf|ttc|otf|eot|woff|woff2)$ {
          expires 11M;
          access_log off;
          add_header Cache-Control "public";
        }

        location ~* \.(?:css|js)$ {
          expires 11M;
          access_log off;
          add_header Cache-Control "public";
        }

}

Where is directive for redirection? Alias domain only add domain to server_name.

Please, I need help with this, Google begins to index two sites and found duplicate content.