Overlay network
参考资料
Network Tunnels with Linux: https://www.jumpingbean.co.za/blogs/mark/linux-network-tunnels
IP over UDP tunnel with socat: https://www.gabriel.urdhr.fr/2016/01/12/ip-over-udp-with-socat/
Foo over UDP: https://lwn.net/Articles/614348/
Multi-Host Networking Overlay with Flannel: https://docker-k8s-lab.readthedocs.io/en/latest/docker/docker-flannel.html（这网站里有很多docker网络相关的动手小实验）
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