Как настроить редирект на домен третьего уровня (nginx)?

server {
    listen 80;
    server_name old.site.ru;
    location / {
        root /путь/ксайту/;
        index old.php;
    }
    location ~* \.(gif|jpg|png)$ {
        expires 30d;
    }

location ~ \.php$ {
                fastcgi_pass 127.0.0.1:9000;
                fastcgi_index index.php;
                fastcgi_param SCRIPT_FILENAME  $document_root$fastcgi_script_name;
                include        fastcgi_params;
    }
location ~* ^.+\.(jpg|jpeg|gif|png|svg|js|css|mp3|ogg|mpe?g|avi|zip|gz|bz2?|rar)$ {
                   access_log off;
                   expires max;
                   error_page 404 = /404.html;
    }

}