1、客户端（主动）

• close —> syn_sent —> established —> fin_wait1 —> fin_wait2 —> time_wait —> 2(msl)
• close —> syn_sent —> established —> fin_wait1 —> closing —> time_wait —> 2(msl)
• close —> syn_sent —> established —> fin_wait1 —> time_wait —> 2(msl)
  • msl：maximum segment lifetime
    [……]

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