nginx如何限制网站来源ip访问

server {
    listen       80;
    server_name  www.ipkd.cn;
    location / {
        root   html;
        index  index.php index.html index.htm;
    }
    //限制ip访问
    location / {
       deny 192.168.0.4;
       allow 192.168.1.0/16;
       allow 10.0.0.0/24;
       deny all;
    }
}