How does one develop a simple VPN Server using Python?

When the brain holes open during running, I want to write a simple VPN Server by myself. I searched for a lot of ready-made libraries or components, but I'm curious about how to implement it if I want to develop it in Python? When the brain holes open during running, I want to write a simple VPN Server by myself. I searched for a lot of ready-made libraries or components, but I'm curious about how to implement it if I want to develop it in Python? Reply: If you only implement a simple VPN for personal use, it is indeed very simple. A maximum of several hundred lines of code are supported.
Because all major operating system kernels have built-in TUN/TAP support, the application layer can easily establish point-to-point tunnel and generate a virtual Nic through corresponding interfaces. Then you can use tools such as iptables to set system data forwarding. Basically, the current VPN is also implemented in this way.


About TUN/TAP:
Https://zh.m.wikipedia.org/wiki/Tun


A very simple Linux C implementation version:
Https://github.com/cloudwu/mptun
Similar to Python implementation, the basic process is to enable/dev/net/tun to operate the TUN interface, and set up a data forwarding channel to forward data such as TCP or UDP.