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This article explains how Linux kernel parameters, memory size, and file descriptor limits determine the maximum number of TCP connections a server or client can handle, provides configuration examples for increasing those limits, and discusses practical considerations such as port ranges and connection overhead.
The article explains how TCP connections are identified by a four‑tuple, why the theoretical maximum client connections are 65,535 due to port limits, how servers can theoretically handle up to 2⁴⁸ connections, and why real‑world concurrency is constrained by memory, file descriptors and port reuse rather than the 65535 port count.
The article explains how TCP connections are identified by a four‑tuple, why the 65535 port limit does not directly cap concurrent connections, the theoretical maximum connections for client and server roles, and how real‑world limits are governed by memory, file descriptors, and port reuse on Linux systems.