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(SYN=0,ACK=1,seq=11221,ack=11221) (SYN=1,ACK=1,seq=11220,ack=11220) (SYN=1,ACK=1,seq=11221,ack=11221) (SYN=0,ACK=1,seq=11220,ack=11220)
reassemble reduce re-create retransmit
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SYN=1,ACK=1 SYN=1,ACK=0 SYN=1,ACK无关 SYN=0,ACK=0
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TCP的23 TCP的21 UDP的23 UDP的21
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1~127 1~255 1~1023 1~65 535
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