The quantum state of a TCP port

This post explores the complex rules governing TCP port sharing in Linux, detailing how different combinations of local IP addresses, ports, and the use of SO_REUSEADDR affect socket binding and connection establishment. It provides a deep dive into the kernel's internal mechanisms for managing network ports and sockets, which is crucial for understanding the underlying infrastructure that supports Cloudflare's global network and its ability to handle massive amounts of traffic efficiently and reliably.