网络原理
https://www.bilibili.com/video/BV1Rx411G7o2
https://www.bilibili.com/video/BV1fh411d7uW
https://www.bilibili.com/video/BV1Rz4y197Jd/
https://www.bilibili.com/video/BV13E411T7vm/

数据报路由模拟
字幕好，不清晰https://www.bilibili.com/video/BV1jx411F7vX
字幕不好，清晰https://www.bilibili.com/video/BV1X7411s7ak

https://blog.csdn.net/GrubLinux/article/details/32018841
https://blog.csdn.net/m0_37681914/article/details/70194400

为什么一个域名会有那么多不同的IP？
https://www.oschina.net/question/227256_112443