#目的 检测当前路由器的ip，检测动态域名的ip，如果动态域名ip跟路由器ip不同，那么路由器ip可能发生变换，发送请求进行变更
#必备条件
#脚本使用 执行./ddns.sh 用户名 密码 你的域名 以上参数都可以在www.noip.com上获得
#参考 如果想使用树莓派在自己的家里搭建一个可以从外网访问的服务，可以使用本脚本来同步ip地址的变化，具体的路由器设置可以参考[]文章](https://www.gitbook.com/book/lijunjieone/mynote/details)
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