请高手帮忙分析wireshark抓包出现的双向重传（一侧dup ack,双向都TCP Out-Of-Order）和发送包长度为 0 的问题，先谢谢

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如下是拷贝的抓包描述，每次 10.254.251.74 发给 10.254.251.103 都会发 2 次然后才会有从 103 回包，wireshark 提示[TCP Out-Of-Order]（应该是因为 2 次的 seq 号一样导致）还有一个问题就是隔几个包 10.254.251.103 会给 10.254.251.74 发送一次长度为 0 的包，然后才发送包含数据的报文。 10.254.251.103 是客户端，和 10.254.251.74 长连接发送业务数据，10.254.251.74 会存储收到的业务数据，10.254.251.74 收到业务数据后回“ 0004OK..”给 10.254.251.103 （如果回的时候 socket 写不成功，则会尝试重写 3 次，连接不断只重写） 850 0.297317 10.254.251.103 10.254.251.74 TCP 52633 > 9978 [PSH, ACK] Seq=1 Ack=1 Win=115 Len=693 TSV=1983788074 TSER=3365181331 857 0.299894 10.254.251.74 10.254.251.103 TCP 9978 > 52633 [PSH, ACK] Seq=1 Ack=694 Win=670 Len=8 TSV=3365181648 TSER=1983788074 858 0.299919 10.254.251.74 10.254.251.103 TCP [TCP Out-Of-Order] 9978 > 52633 [PSH, ACK] Seq=1 Ack=694 Win=670 Len=8 TSV=3365181648 TSER=1983788074 859 0.300071 10.254.251.103 10.254.251.74 TCP 52633 > 9978 [ACK] Seq=694 Ack=9 Win=115 Len=0 TSV=1983788077 TSER=3365181648 868 0.303283 10.254.251.103 10.254.251.74 TCP 52633 > 9978 [PSH, ACK] Seq=694 Ack=9 Win=115 Len=689 TSV=1983788080 TSER=3365181648 871 0.303439 10.254.251.74 10.254.251.103 TCP 9978 > 52633 [PSH, ACK] Seq=9 Ack=1383 Win=670 Len=8 TSV=3365181651 TSER=1983788080 872 0.303441 10.254.251.74 10.254.251.103 TCP [TCP Out-Of-Order] 9978 > 52633 [PSH, ACK] Seq=9 Ack=1383 Win=670 Len=8 TSV=3365181651 TSER=1983788080 873 0.305156 10.254.251.103 10.254.251.74 TCP 52633 > 9978 [PSH, ACK] Seq=1383 Ack=17 Win=115 Len=689 TSV=1983788082 TSER=3365181651 875 0.305851 10.254.251.74 10.254.251.103 TCP 9978 > 52633 [PSH, ACK] Seq=17 Ack=2072 Win=670 Len=8 TSV=3365181654 TSER=1983788082 876 0.305929 10.254.251.74 10.254.251.103 TCP [TCP Out-Of-Order] 9978 > 52633 [PSH, ACK] Seq=17 Ack=2072 Win=670 Len=8 TSV=3365181654 TSER=1983788082 881 0.307979 10.254.251.103 10.254.251.74 TCP 52633 > 9978 [PSH, ACK] Seq=2072 Ack=25 Win=115 Len=748 TSV=1983788084 TSER=3365181654 888 0.309467 10.254.251.74 10.254.251.103 TCP 9978 > 52633 [PSH, ACK] Seq=25 Ack=2820 Win=670 Len=8 TSV=3365181657 TSER=1983788084 889 0.309472 10.254.251.74 10.254.251.103 TCP [TCP Out-Of-Order] 9978 > 52633 [PSH, ACK] Seq=25 Ack=2820 Win=670 Len=8 TSV=3365181657 TSER=1983788084 对端的抓包记录（截取了一段），TCP Out-Of-Order 在客户端也是每次发送都会出现，但多一个 TCP Dup ACK，TCP Dup ACK 大概每 15 个包会出现一次，先谢谢帮忙的各位： 1 0.000000 10.254.251.74 10.254.251.103 TCP 9978 > 39934 [PSH, ACK] Seq=1 Ack=1 Win=817 Len=8 TSV=132194778 TSER=3044963545 4 0.019092 10.254.251.103 10.254.251.74 TCP 39934 > 9978 [PSH, ACK] Seq=1 Ack=9 Win=115 Len=672 TSV=3044963566 TSER=132194778 5 0.019111 10.254.251.103 10.254.251.74 TCP [TCP Out-Of-Order] 39934 > 9978 [PSH, ACK] Seq=1 Ack=9 Win=115 Len=672 TSV=3044963566 TSER=132194778 6 0.020369 10.254.251.74 10.254.251.103 TCP 9978 > 39934 [PSH, ACK] Seq=9 Ack=673 Win=817 Len=8 TSV=132194799 TSER=3044963566 7 0.023970 10.254.251.103 10.254.251.74 TCP 39934 > 9978 [PSH, ACK] Seq=673 Ack=17 Win=115 Len=786 TSV=3044963571 TSER=132194799 8 0.023976 10.254.251.103 10.254.251.74 TCP [TCP Out-Of-Order] 39934 > 9978 [PSH, ACK] Seq=673 Ack=17 Win=115 Len=786 TSV=3044963571 TSER=132194799 9 0.024614 10.254.251.74 10.254.251.103 TCP 9978 > 39934 [PSH, ACK] Seq=17 Ack=1459 Win=817 Len=8 TSV=132194803 TSER=3044963571 10 0.027786 10.254.251.103 10.254.251.74 TCP 39934 > 9978 [PSH, ACK] Seq=1459 Ack=25 Win=115 Len=692 TSV=3044963575 TSER=132194803 11 0.027791 10.254.251.103 10.254.251.74 TCP [TCP Out-Of-Order] 39934 > 9978 [PSH, ACK] Seq=1459 Ack=25 Win=115 Len=692 TSV=3044963575 TSER=132194803 12 0.028712 10.254.251.74 10.254.251.103 TCP 9978 > 39934 [PSH, ACK] Seq=25 Ack=2151 Win=817 Len=8 TSV=132194807 TSER=3044963575 13 0.036293 10.254.251.103 10.254.251.74 TCP 39934 > 9978 [PSH, ACK] Seq=2151 Ack=33 Win=115 Len=843 TSV=3044963584 TSER=132194807 14 0.036300 10.254.251.103 10.254.251.74 TCP [TCP Out-Of-Order] 39934 > 9978 [PSH, ACK] Seq=2151 Ack=33 Win=115 Len=843 TSV=3044963584 TSER=132194807 15 0.036581 10.254.251.74 10.254.251.103 TCP 9978 > 39934 [PSH, ACK] Seq=33 Ack=2994 Win=817 Len=8 TSV=132194815 TSER=3044963584 16 0.040643 10.254.251.103 10.254.251.74 TCP 39934 > 9978 [PSH, ACK] Seq=2994 Ack=41 Win=115 Len=691 TSV=3044963588 TSER=132194815 17 0.040651 10.254.251.103 10.254.251.74 TCP [TCP Out-Of-Order] 39934 > 9978 [PSH, ACK] Seq=2994 Ack=41 Win=115 Len=691 TSV=3044963588 TSER=132194815 18 0.041855 10.254.251.74 10.254.251.103 TCP 9978 > 39934 [PSH, ACK] Seq=41 Ack=3685 Win=817 Len=8 TSV=132194820 TSER=3044963588 33 0.081157 10.254.251.103 10.254.251.74 TCP 39934 > 9978 [ACK] Seq=3685 Ack=49 Win=115 Len=0 TSV=3044963629 TSER=132194820 34 0.081162 10.254.251.103 10.254.251.74 TCP [TCP Dup ACK 33#1] 39934 > 9978 [ACK] Seq=3685 Ack=49 Win=115 Len=0 TSV=3044963629 TSER=132194820

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