https://blog.wongcw.com/2022/08/25/d%e5%8a%a0%e5%af%86%e5%b0%87%e6%94%af%e6%8c%81switch%e9%81%8a%e6%88%b2ns%e6%a8%a1%e6%93%ac%e5%99%a8%e5%a5%bd%e6%97%a5%e5%ad%90%e5%88%b0%e9%a0%ad%e4%ba%86%ef%bc%9f/