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本文紧接前篇文章《》，讨论4次挥手的过程。
主动关闭方 被动关闭方
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ESTABLISHED ESTABLISHED
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FIN_WAIT_1 ---------------------------FIN=1, seq=u----------------------------->CLOSE_WAIT
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FIN_WAIT_2 <---------------------ACK=1, seq=v, ack=u+1-------------------CLOSE_WAIT
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TIME_WAIT <---------------FIN=1, ACK=1, seq=w, ack=u+1------------ LAST_ACK
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TIME_WAIT ----------------ACK=1, seq=u+1, ack=w+1 -------------------> CLOSE
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|before releasing connection, it MUST wait for 2MSL |
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CLOSE CLOSE
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