NOT ENOUGH TICKET NUMBERS ASSIGNED TO DEVICE 说明:电子客票号分配不够 DUPLICATE SEGMENT 重复部分 PNR TICKETED 翻译为PNR已出过票，但多数是由于代理没规范订座，ETDZ时假票号并未删除，方法一多做几次直到出票成功，方法二规范...
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The purpose of this duplicate ACK is to let the other end know that a segment was received out of order, and to tell it what sequence number is expected.
这个相同应答的意图是让对端知道一个分片被收到的时候出现问题，并且告诉它希望得到的序列号。
TCP may generate an immediate acknowledgment (a duplicate ack) when an out - of-order segment is received.
当收到一个出问题的分片，Tcp立即产生一个应答。
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