Mastering TCP: How the Three‑Way Handshake and Socket States Work

This article explains TCP’s three‑way handshake, details each socket state from CLOSED to ESTABLISHED, describes SYN‑Flood attacks, and provides Linux kernel tuning commands to optimize TCP performance and security.

Socket stateslinux

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Mastering TCP: How the Three‑Way Handshake and Socket States Work

Efficient Ops

Jul 18, 2022 · Fundamentals

Mastering TCP: Decode Every Connection State and Diagnose Network Issues

This article explains TCP connection states, common Linux network commands, the three‑way handshake, four‑way termination, simultaneous open/close, flag meanings, and practical troubleshooting techniques such as keep‑alive and error handling, providing a comprehensive guide for network engineers.

Socket statesTCPTCP handshake

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Mastering TCP: Decode Every Connection State and Diagnose Network Issues