主题： tcp

• TCP connections: the handshake, retransmission timers and keep-alives

  A TCP connection starts with a three-way handshake, recovers lost segments by a retransmission timer that doubles on each failure, and is only checked for liveness if keep-alives are switched on per socket. Linux defaults mean a hung peer takes minutes to notice and an idle connection two hours before the first probe.

  article · en · reviewed · 知识截至 2026-09-15

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