Cognitive Technology Team

Aug 12, 2023 · Fundamentals

Understanding Linux TCP SYN and Accept Queues in the Three‑Way Handshake

This article explains how the Linux kernel maintains the SYN (half‑connection) and Accept (full‑connection) queues during the TCP three‑way handshake, describes their size limits, overflow handling, and common defenses against SYN‑flood attacks.