https://blog.wongcw.com/2021/04/07/zyxel%e6%8e%a8%e5%87%baxgs1250-12%e4%ba%a4%e6%8f%9b%e6%a9%9f%e9%85%8d%e5%82%993%e5%80%8b%e8%90%ac%e5%85%86%e9%9b%bb%e5%8f%a31%e5%80%8b%e8%90%ac%e5%85%86%e5%85%89%e5%8f%a3/