禁止以ip方式訪問網站

好比192.168.16.116是個人服務器地址，域名是www.demo.com，我想只容許用戶經過域名訪問，而不容許用戶經過ip訪問，全部經過ip訪問的都跳轉到域名，第一個server部分爲起做用的配置代碼

 

nginx配置以下：

server {
        server_name 80 default;
        server_name _;
        rewrite ^(.*) http://www.demo.com;
        }

server {

        server_name localhost www.demo.com;

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

        location / {
                index index.php;
                try_files $uri $uri/ /index.html;
        }

        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
        #
        location ~ \.php$ {

                fastcgi_pass unix:/var/run/php5-fpm.sock;
                fastcgi_index index.php;
                include fastcgi_params;
        }

}