这种技术叫做强制认证门户（Captive Portal）技术，主流的实现方法有两种：DNS拦截和HTTP重定向。
1）DNS拦截：拦截所有的DNS请求，并一律返回无线控制器自身的IP地址，然后不管你上什么网就都会看到无线控制器上设置的页面了。（如果你在浏览器中输入IP地址，你就会得到404。）
2）HTTP重定向：利用HTTP的重定向功能将所有的HTTP请求重新定向到无线控制器上。然后无论采用哪种技术，用户都会看到登录页面，然后登录，成功之后无线控制器会将用户改为已认证状态，并不再使用拦截（或者重定向）。发布于 2013-12-16
12 replies on “redirection”
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