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  3. HTTP没有通过局域网完成。 硬件原因？
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HTTP没有通过局域网完成。 硬件原因？

在运行Windows Server 2012上的Apache 2.2的客户服务器上，我们注意到有时对服务器的某些请求永远无法完成。 使用wireshark我发现，一旦重新开始应答请求，一批重复的ACK就会发送到服务器，并在几秒钟后从服务器收到几个重新传输。

networking设置对于服务器和一些使用UTP电缆连接到交换机的客户端来说是非常基本的。

我真的不知道该怎么做。 我正在考虑让他们尝试不同的布线，交换机和/或网卡，但是我想就此发表意见。 

1 0.000000000 192.168.1.103 -> 192.168.2.100 TCP 66 52011?81 [SYN] Seq=0 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1 2 0.000742000 192.168.2.100 -> 192.168.1.103 TCP 66 81?52011 [SYN, ACK] Seq=0 Ack=1 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1 3 0.000782000 192.168.1.103 -> 192.168.2.100 TCP 54 52011?81 [ACK] Seq=1 Ack=1 Win=65536 Len=0 4 0.001646000 192.168.1.103 -> 192.168.2.100 HTTP 606 GET /symfony/web/app.php/legacy/mutaties/afroepen.php?afroepid=16250 HTTP/1.1 5 0.002353000 192.168.2.100 -> 192.168.1.103 TCP 60 81?52011 [ACK] Seq=1 Ack=553 Win=65536 Len=0 6 0.747171000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP segment of a reassembled PDU] 7 0.747172000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP segment of a reassembled PDU] 8 0.747246000 192.168.1.103 -> 192.168.2.100 TCP 54 52011?81 [ACK] Seq=553 Ack=2921 Win=65536 Len=0 9 0.747504000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP segment of a reassembled PDU] 10 0.747507000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP segment of a reassembled PDU] 11 0.747562000 192.168.1.103 -> 192.168.2.100 TCP 54 52011?81 [ACK] Seq=553 Ack=5841 Win=65536 Len=0 12 0.748241000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP segment of a reassembled PDU] 13 0.748242000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP segment of a reassembled PDU] 14 0.748243000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP segment of a reassembled PDU] 15 0.748244000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP segment of a reassembled PDU] 16 0.748319000 192.168.1.103 -> 192.168.2.100 TCP 66 52011?81 [ACK] Seq=553 Ack=7301 Win=65536 Len=0 SLE=8761 SRE=10221 17 0.748338000 192.168.1.103 -> 192.168.2.100 TCP 66 [TCP Dup ACK 16#1] 52011?81 [ACK] Seq=553 Ack=7301 Win=65536 Len=0 SLE=8761 SRE=11681 18 0.748593000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP segment of a reassembled PDU] 19 0.748594000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP segment of a reassembled PDU] 20 0.748595000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP segment of a reassembled PDU] 21 0.748624000 192.168.1.103 -> 192.168.2.100 TCP 66 [TCP Dup ACK 16#2] 52011?81 [ACK] Seq=553 Ack=7301 Win=65536 Len=0 SLE=8761 SRE=13141 22 0.748643000 192.168.1.103 -> 192.168.2.100 TCP 66 [TCP Dup ACK 16#3] 52011?81 [ACK] Seq=553 Ack=7301 Win=65536 Len=0 SLE=8761 SRE=14601 23 0.748654000 192.168.1.103 -> 192.168.2.100 TCP 66 [TCP Dup ACK 16#4] 52011?81 [ACK] Seq=553 Ack=7301 Win=65536 Len=0 SLE=8761 SRE=16061 24 0.748965000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP segment of a reassembled PDU] 25 0.748966000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP segment of a reassembled PDU] 26 0.748967000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP segment of a reassembled PDU] 27 0.748999000 192.168.1.103 -> 192.168.2.100 TCP 74 [TCP Dup ACK 16#5] 52011?81 [ACK] Seq=553 Ack=7301 Win=65536 Len=0 SLE=17521 SRE=18981 SLE=8761 SRE=16061 28 0.749014000 192.168.1.103 -> 192.168.2.100 TCP 74 [TCP Dup ACK 16#6] 52011?81 [ACK] Seq=553 Ack=7301 Win=65536 Len=0 SLE=17521 SRE=20441 SLE=8761 SRE=16061 29 0.749249000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP segment of a reassembled PDU] 30 0.749250000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP segment of a reassembled PDU] 31 0.749275000 192.168.1.103 -> 192.168.2.100 TCP 74 [TCP Dup ACK 16#7] 52011?81 [ACK] Seq=553 Ack=7301 Win=65536 Len=0 SLE=17521 SRE=21901 SLE=8761 SRE=16061 32 0.749289000 192.168.1.103 -> 192.168.2.100 TCP 74 [TCP Dup ACK 16#8] 52011?81 [ACK] Seq=553 Ack=7301 Win=65536 Len=0 SLE=17521 SRE=23361 SLE=8761 SRE=16061 33 0.749578000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP Fast Retransmission] 81?52011 [PSH, ACK] Seq=7301 Ack=553 Win=65536 Len=1460[Reassembly error, protocol TCP: New fragment overlaps old data (retransmission?)] 34 0.749581000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP segment of a reassembled PDU] 35 0.749907000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP segment of a reassembled PDU] 36 0.749909000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP segment of a reassembled PDU] 37 0.749910000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP Out-Of-Order] 81?52011 [PSH, ACK] Seq=16061 Ack=553 Win=65536 Len=1460[Reassembly error, protocol TCP: New fragment overlaps old data (retransmission?)] 38 0.749939000 192.168.1.103 -> 192.168.2.100 TCP 82 [TCP Dup ACK 16#9] 52011?81 [ACK] Seq=553 Ack=7301 Win=65536 Len=0 SLE=24821 SRE=26281 SLE=17521 SRE=23361 SLE=8761 SRE=16061 39 0.749958000 192.168.1.103 -> 192.168.2.100 TCP 82 [TCP Dup ACK 16#10] 52011?81 [ACK] Seq=553 Ack=7301 Win=65536 Len=0 SLE=24821 SRE=27741 SLE=17521 SRE=23361 SLE=8761 SRE=16061 40 0.750240000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP segment of a reassembled PDU] 41 0.750241000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP segment of a reassembled PDU] 42 0.750269000 192.168.1.103 -> 192.168.2.100 TCP 82 [TCP Dup ACK 16#11] 52011?81 [ACK] Seq=553 Ack=7301 Win=65536 Len=0 SLE=24821 SRE=29201 SLE=17521 SRE=23361 SLE=8761 SRE=16061 43 0.750289000 192.168.1.103 -> 192.168.2.100 TCP 82 [TCP Dup ACK 16#12] 52011?81 [ACK] Seq=553 Ack=7301 Win=65536 Len=0 SLE=24821 SRE=30661 SLE=17521 SRE=23361 SLE=8761 SRE=16061 44 0.750622000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP segment of a reassembled PDU] 45 0.750624000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP segment of a reassembled PDU] 46 0.750649000 192.168.1.103 -> 192.168.2.100 TCP 82 [TCP Dup ACK 16#13] 52011?81 [ACK] Seq=553 Ack=7301 Win=65536 Len=0 SLE=24821 SRE=32121 SLE=17521 SRE=23361 SLE=8761 SRE=16061 47 0.751016000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP Out-Of-Order] 81?52011 [PSH, ACK] Seq=23361 Ack=553 Win=65536 Len=1460[Reassembly error, protocol TCP: New fragment overlaps old data (retransmission?)] 48 0.751017000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP segment of a reassembled PDU] 49 0.751059000 192.168.1.103 -> 192.168.2.100 TCP 90 [TCP Dup ACK 16#14] 52011?81 [ACK] Seq=553 Ack=7301 Win=65536 Len=0 SLE=33581 SRE=35041 SLE=24821 SRE=32121 SLE=17521 SRE=23361 SLE=8761 SRE=16061 50 0.751549000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP segment of a reassembled PDU] 51 0.751551000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP segment of a reassembled PDU] 52 0.751567000 192.168.1.103 -> 192.168.2.100 TCP 90 [TCP Dup ACK 16#15] 52011?81 [ACK] Seq=553 Ack=7301 Win=65536 Len=0 SLE=33581 SRE=36501 SLE=24821 SRE=32121 SLE=17521 SRE=23361 SLE=8761 SRE=16061 53 0.751582000 192.168.1.103 -> 192.168.2.100 TCP 90 [TCP Dup ACK 16#16] 52011?81 [ACK] Seq=553 Ack=7301 Win=65536 Len=0 SLE=33581 SRE=37961 SLE=24821 SRE=32121 SLE=17521 SRE=23361 SLE=8761 SRE=16061 54 0.752392000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP segment of a reassembled PDU] 55 0.752393000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP segment of a reassembled PDU] 56 0.752394000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP Out-Of-Order] 81?52011 [PSH, ACK] Seq=32121 Ack=553 Win=65536 Len=1460[Reassembly error, protocol TCP: New fragment overlaps old data (retransmission?)] 57 0.752396000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP segment of a reassembled PDU] 58 0.752406000 192.168.1.103 -> 192.168.2.100 TCP 90 [TCP Dup ACK 16#17] 52011?81 [ACK] Seq=553 Ack=7301 Win=65536 Len=0 SLE=33581 SRE=39421 SLE=24821 SRE=32121 SLE=17521 SRE=23361 SLE=8761 SRE=16061 59 0.752433000 192.168.1.103 -> 192.168.2.100 TCP 90 [TCP Dup ACK 16#18] 52011?81 [ACK] Seq=553 Ack=7301 Win=65536 Len=0 SLE=40881 SRE=42341 SLE=33581 SRE=39421 SLE=24821 SRE=32121 SLE=17521 SRE=23361 60 0.753551000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP segment of a reassembled PDU] 61 0.753553000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP segment of a reassembled PDU] 62 0.753571000 192.168.1.103 -> 192.168.2.100 TCP 90 [TCP Dup ACK 16#19] 52011?81 [ACK] Seq=553 Ack=7301 Win=65536 Len=0 SLE=40881 SRE=43801 SLE=33581 SRE=39421 SLE=24821 SRE=32121 SLE=17521 SRE=23361 63 0.753588000 192.168.1.103 -> 192.168.2.100 TCP 90 [TCP Dup ACK 16#20] 52011?81 [ACK] Seq=553 Ack=7301 Win=65536 Len=0 SLE=40881 SRE=45261 SLE=33581 SRE=39421 SLE=24821 SRE=32121 SLE=17521 SRE=23361 64 0.754550000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP segment of a reassembled PDU] 65 0.754553000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP Out-Of-Order] 81?52011 [PSH, ACK] Seq=39421 Ack=553 Win=65536 Len=1460[Reassembly error, protocol TCP: New fragment overlaps old data (retransmission?)] 66 0.754553000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP segment of a reassembled PDU] 67 0.754572000 192.168.1.103 -> 192.168.2.100 TCP 90 [TCP Dup ACK 16#21] 52011?81 [ACK] Seq=553 Ack=7301 Win=65536 Len=0 SLE=40881 SRE=46721 SLE=33581 SRE=39421 SLE=24821 SRE=32121 SLE=17521 SRE=23361 68 0.754610000 192.168.1.103 -> 192.168.2.100 TCP 90 [TCP Dup ACK 16#22] 52011?81 [ACK] Seq=553 Ack=7301 Win=65536 Len=0 SLE=40881 SRE=48181 SLE=33581 SRE=39421 SLE=24821 SRE=32121 SLE=17521 SRE=23361 69 1.055597000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP Retransmission] 81?52011 [PSH, ACK] Seq=7301 Ack=553 Win=65536 Len=1460[Reassembly error, protocol TCP: New fragment overlaps old data (retransmission?)] 70 1.664583000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP Retransmission] 81?52011 [PSH, ACK] Seq=7301 Ack=553 Win=65536 Len=1460[Reassembly error, protocol TCP: New fragment overlaps old data (retransmission?)] 71 2.867842000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP Retransmission] 81?52011 [PSH, ACK] Seq=7301 Ack=553 Win=65536 Len=1460[Reassembly error, protocol TCP: New fragment overlaps old data (retransmission?)] 72 5.274379000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP Retransmission] 81?52011 [PSH, ACK] Seq=7301 Ack=553 Win=65536 Len=1460[Reassembly error, protocol TCP: New fragment overlaps old data (retransmission?)] 73 10.071711000 192.168.2.100 -> 192.168.1.103 TCP 1514 [TCP Retransmission] 81?52011 [PSH, ACK] Seq=7301 Ack=553 Win=65536 Len=1460[Reassembly error, protocol TCP: New fragment overlaps old data (retransmission?)] 74 19.685995000 192.168.2.100 -> 192.168.1.103 TCP 60 81?52011 [RST, ACK] Seq=8761 Ack=553 Win=0 Len=0 75 19.686030000 192.168.1.103 -> 192.168.2.100 TCP 90 [TCP Dup ACK 16#23] 52011?81 [ACK] Seq=553 Ack=7301 Win=65536 Len=0 SLE=40881 SRE=48181 SLE=33581 SRE=39421 SLE=24821 SRE=32121 SLE=17521 SRE=23361 76 45.752325000 192.168.1.103 -> 192.168.2.100 TCP 55 [TCP Keep-Alive] [TCP Window Full] 52011?81 [ACK] Seq=552 Ack=7301 Win=65536 Len=1 77 58.686133000 192.168.1.103 -> 192.168.2.100 TCP 54 52011?81 [FIN, ACK] Seq=553 Ack=7301 Win=65536 Len=0 78 58.985830000 192.168.1.103 -> 192.168.2.100 TCP 54 [TCP Retransmission] 52011?81 [FIN, ACK] Seq=553 Ack=7301 Win=65536 Len=0 79 59.585853000 192.168.1.103 -> 192.168.2.100 TCP 54 [TCP Retransmission] 52011?81 [FIN, ACK] Seq=553 Ack=7301 Win=65536 Len=0 80 60.785894000 192.168.1.103 -> 192.168.2.100 TCP 54 [TCP Retransmission] 52011?81 [FIN, ACK] Seq=553 Ack=7301 Win=65536 Len=0 81 63.185944000 192.168.1.103 -> 192.168.2.100 TCP 54 [TCP Retransmission] 52011?81 [FIN, ACK] Seq=553 Ack=7301 Win=65536 Len=0 82 67.988211000 192.168.1.103 -> 192.168.2.100 TCP 54 [TCP Retransmission] 52011?81 [FIN, ACK] Seq=553 Ack=7301 Win=65536 Len=0 83 77.582500000 192.168.1.103 -> 192.168.2.100 TCP 54 52011?81 [RST, ACK] Seq=554 Ack=7301 Win=0 Len=0

该日志对我来说，是一个布线问题或设备和交换机之间的双工不匹配。 我考虑强制两个设备（服务器和客户端）上的NIC上的速度/双工到100Base-TX半双工，然后从那里开始工作。

伪劣的修补程序电缆，错误的NIC驱动程序或故障切换也可能导致这些行为。 尝试通过系统的方法来分离问题是很重要的 – 在进行进一步的修改之前，一次改变一件事物并进行testing。

从VirtualBox 5.1上的Windows 2012 Server R2 Core guest虚拟机启动连接，并将Centos 6作为VirtualBox主机连接到桥接networking时，发现类似的问题。 虽然我仍在研究这个问题，但在Windows机器上禁用ECN（ https://en.wikipedia.org/wiki/Explicit_Congestion_Notification ）解决了我的问题。 你的踪迹显示，ECN被禁用，所以它不是答案，但我认为这可能会帮助其他人。

编辑：禁用GRO（通用接收卸载）也工作使其工作： 

 ethtool -K eth0 gro off

我会说你只在那里丢了一个包。 客户端正在进行select性确认并获取除一个数据包之外的所有数据。 Wireshark说这是一个重复的确认，但事实并非如此 。 最后，服务器决定在第69帧发送丢失的数据包（在发送HTTP响应之后0.3秒），尝试4次并决定由于超时（客户端无响应）而终止连接。 客户最终决定承认它收到丢失的数据包，方式在预期之后。

客户端对我来说很奇怪。 排除networking堆栈中的任何第三方驱动程序（ 例如防病毒或其他安全软件 ）。 也试图排除之间的任何设备可以做包检查。 尽pipe基于时间差值，我认为捕获是在客户端进行的，所以几乎排除了第三方设备正在修改客户端数据包的情况。

丢失帧的重传已经在第33帧 – 你可以通过seq = 7301来判断。

33 0.749578000 192.168.2.100 – > 192.168.1.103 TCP 1514 [TCP快速重传] 81 52011 [PSH，ACK] Seq = 7301 Ack = 553 Win = 65536 Len = 1460

同样重复的Ack是存在的 – 因为有多个Ack与Ack = 7301，因为这是缺less的帧。

只是客户不认识这个框架。

我猜测跟踪已经在服务器上 – 看到传出的数据包 – 但它们可能不会在客户端接收 – （由dup ack表示）数据包。

客户端的情况可能会显示这些框架从来没有得到提升。 所以我会说 – 已经提到的布线或双工设置将是一个很好的猜测原因。