ngx_http_access_module**模块**

1、allow address | CIDR | unix: | all;

2、deny address | CIDR | unix: | all;

http, server, location, limit_except

自上而下检查，一旦匹配，将生效，条件严格的置前

示例：

location / {

deny 192.168.1.1;

allow 192.168.1.0/24;

allow 10.1.1.0/16;

allow 2001:0db8::/32;

deny all;

}