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为什么客户端TCP有时不发送ACK，导致重传？

2011-12-21 119 views
0

这是我有：为什么客户端TCP有时不发送ACK，导致重传？

客户端（192.168.11.121）：Windows Vista中，火狐

服务器端（192.168.11.16）：Windows 2003中，我的Web服务器或IIS上

运行提琴手客户端显示，即使图像尺寸相同，某些图像的下载时间也会比其他图像长得多。我运行了客户端数据包跟踪，发现“快速”和“慢速”下载之间的区别在于，对于慢速下载，客户端正在快速接收数据，但不发送ACK，导致服务器重新传输。下面的第一个跟踪包含成功请求和缓慢请求。

成功的图像请求： 1132是来自浏览器的图像请求 1133-1155是响应。当服务器发送数据包时，客户端在到达时确认它们

带重传的图像请求： 1159是来自浏览器的图像请求 1160-1182是响应。这次客户端没有确认数据包。 1183是从客户端到服务器的重复ack - 为什么？

我已阅读关于延迟的ACK，但我不认为这些条件适用，因为客户端应该至少每隔一个数据包，对不对？

客户是否认为存在缺少的数据包，因此没有发送消息？有丢包吗？如果是这样，我不会看到它。

我已经尝试了2台客户机与此服务器 - 两个问题清单。这两个客户端都可以从运行相同操作系统和Web服务器的其他服务器下载图像。所以我认为这是一个服务器端问题，但是什么？

No.  Time  Source    Destination   Protocol Info 
    1132 7.217259 192.168.11.121  192.168.11.16   TCP  60781 > ddi-tcp-1 [PSH, ACK] Seq=6097 Ack=75896 Win=65700 Len=1016 
    1133 7.219314 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=75896 Ack=7113 Win=64519 Len=1460 
    1134 7.219318 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=77356 Ack=7113 Win=64519 Len=1460 
    1135 7.219339 192.168.11.121  192.168.11.16   TCP  60781 > ddi-tcp-1 [ACK] Seq=7113 Ack=78816 Win=65700 Len=0 
    1136 7.219654 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=78816 Ack=7113 Win=64519 Len=1460 
    1137 7.219656 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=80276 Ack=7113 Win=64519 Len=1460 
    1138 7.219659 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=81736 Ack=7113 Win=64519 Len=1460 
    1139 7.219675 192.168.11.121  192.168.11.16   TCP  60781 > ddi-tcp-1 [ACK] Seq=7113 Ack=83196 Win=65700 Len=0 
    1140 7.219978 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=83196 Ack=7113 Win=64519 Len=1460 
    1141 7.219980 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=84656 Ack=7113 Win=64519 Len=1460 
    1142 7.219991 192.168.11.121  192.168.11.16   TCP  60781 > ddi-tcp-1 [ACK] Seq=7113 Ack=86116 Win=65700 Len=0 
    1143 7.220310 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=86116 Ack=7113 Win=64519 Len=1460 
    1144 7.220313 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=87576 Ack=7113 Win=64519 Len=1460 
    1145 7.220315 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=89036 Ack=7113 Win=64519 Len=1460 
    1146 7.220327 192.168.11.121  192.168.11.16   TCP  60781 > ddi-tcp-1 [ACK] Seq=7113 Ack=90496 Win=65700 Len=0 
    1147 7.220645 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=90496 Ack=7113 Win=64519 Len=1460 
    1148 7.220647 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=91956 Ack=7113 Win=64519 Len=1460 
    1149 7.220649 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=93416 Ack=7113 Win=64519 Len=1460 
    1150 7.220662 192.168.11.121  192.168.11.16   TCP  60781 > ddi-tcp-1 [ACK] Seq=7113 Ack=94876 Win=65700 Len=0 
    1151 7.220976 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=94876 Ack=7113 Win=64519 Len=1460 
    1152 7.220978 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=96336 Ack=7113 Win=64519 Len=1460 
    1153 7.220989 192.168.11.121  192.168.11.16   TCP  60781 > ddi-tcp-1 [ACK] Seq=7113 Ack=97796 Win=65700 Len=0 
    1154 7.221316 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=97796 Ack=7113 Win=64519 Len=1460 
    1155 7.221319 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [PSH, ACK] Seq=99256 Ack=7113 Win=64519 Len=710 
    1156 7.221335 192.168.11.121  192.168.11.16   TCP  60781 > ddi-tcp-1 [ACK] Seq=7113 Ack=99966 Win=65700 Len=0 
    1159 7.414879 192.168.11.121  192.168.11.16   TCP  60781 > ddi-tcp-1 [PSH, ACK] Seq=7113 Ack=99966 Win=65700 Len=1016 
    1160 7.417006 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=99966 Ack=8129 Win=65535 Len=1460 
    1161 7.417009 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=101426 Ack=8129 Win=65535 Len=1460 
    1162 7.417337 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=102886 Ack=8129 Win=65535 Len=1460 
    1163 7.417339 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=104346 Ack=8129 Win=65535 Len=1460 
    1164 7.417343 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=105806 Ack=8129 Win=65535 Len=1460 
    1165 7.417661 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=107266 Ack=8129 Win=65535 Len=1460 
    1166 7.417664 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=108726 Ack=8129 Win=65535 Len=1460 
    1167 7.418004 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=110186 Ack=8129 Win=65535 Len=1460 
    1168 7.418006 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=111646 Ack=8129 Win=65535 Len=1460 
    1169 7.418008 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=113106 Ack=8129 Win=65535 Len=1460 
    1170 7.418336 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=114566 Ack=8129 Win=65535 Len=1460 
    1171 7.418339 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=116026 Ack=8129 Win=65535 Len=1460 
    1172 7.418342 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=117486 Ack=8129 Win=65535 Len=1460 
    1173 7.418674 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=118946 Ack=8129 Win=65535 Len=1460 
    1174 7.418677 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=120406 Ack=8129 Win=65535 Len=1460 
    1175 7.419002 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=121866 Ack=8129 Win=65535 Len=1460 
    1176 7.419004 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=123326 Ack=8129 Win=65535 Len=1460 
    1177 7.419007 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=124786 Ack=8129 Win=65535 Len=1460 
    1178 7.419375 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=126246 Ack=8129 Win=65535 Len=1460 
    1179 7.419378 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=127706 Ack=8129 Win=65535 Len=1460 
    1180 7.419708 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=129166 Ack=8129 Win=65535 Len=1460 
    1181 7.419710 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=130626 Ack=8129 Win=65535 Len=1460 
    1182 7.419712 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [PSH, ACK] Seq=132086 Ack=8129 Win=65535 Len=316 
    1183 7.419741 192.168.11.121  192.168.11.16   TCP  [TCP Dup ACK 1159#1] 60781 > ddi-tcp-1 [ACK] Seq=8129 Ack=99966 Win=65700 Len=0 SLE=132086 SRE=132402 
    1186 7.617479 192.168.11.16   192.168.11.121  TCP  [TCP Dup ACK 1182#1] ddi-tcp-1 > 60781 [ACK] Seq=132402 Ack=8129 Win=65535 Len=0 
    1187 7.742696 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] ddi-tcp-1 > 60781 [ACK] Seq=99966 Ack=8129 Win=65535 Len=1460 
    1188 7.939708 192.168.11.121  192.168.11.16   TCP  60781 > ddi-tcp-1 [ACK] Seq=8129 Ack=101426 Win=65700 Len=0 SLE=132086 SRE=132402 
    1189 7.940725 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] ddi-tcp-1 > 60781 [ACK] Seq=101426 Ack=8129 Win=65535 Len=1460 
    1190 7.940727 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] ddi-tcp-1 > 60781 [ACK] Seq=102886 Ack=8129 Win=65535 Len=1460 
    1191 7.940750 192.168.11.121  192.168.11.16   TCP  60781 > ddi-tcp-1 [ACK] Seq=8129 Ack=104346 Win=65700 Len=0 SLE=132086 SRE=132402 
    1192 7.941698 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] ddi-tcp-1 > 60781 [ACK] Seq=104346 Ack=8129 Win=65535 Len=1460 
    1193 7.941700 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] ddi-tcp-1 > 60781 [ACK] Seq=105806 Ack=8129 Win=65535 Len=1460 
    1194 7.941712 192.168.11.121  192.168.11.16   TCP  60781 > ddi-tcp-1 [ACK] Seq=8129 Ack=107266 Win=65700 Len=0 SLE=132086 SRE=132402 
    1195 7.942030 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] ddi-tcp-1 > 60781 [ACK] Seq=107266 Ack=8129 Win=65535 Len=1460 
    1196 7.942684 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] ddi-tcp-1 > 60781 [ACK] Seq=108726 Ack=8129 Win=65535 Len=1460 
    1197 7.942687 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] ddi-tcp-1 > 60781 [ACK] Seq=110186 Ack=8129 Win=65535 Len=1460 
    1198 7.942700 192.168.11.121  192.168.11.16   TCP  60781 > ddi-tcp-1 [ACK] Seq=8129 Ack=111646 Win=65700 Len=0 SLE=132086 SRE=132402 
    1199 7.943015 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] ddi-tcp-1 > 60781 [ACK] Seq=111646 Ack=8129 Win=65535 Len=1460 
    1200 7.943651 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] ddi-tcp-1 > 60781 [ACK] Seq=113106 Ack=8129 Win=65535 Len=1460 
    1201 7.943653 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] ddi-tcp-1 > 60781 [ACK] Seq=114566 Ack=8129 Win=65535 Len=1460 
    1202 7.943664 192.168.11.121  192.168.11.16   TCP  60781 > ddi-tcp-1 [ACK] Seq=8129 Ack=116026 Win=65700 Len=0 SLE=132086 SRE=132402 
    1203 7.943983 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] ddi-tcp-1 > 60781 [ACK] Seq=116026 Ack=8129 Win=65535 Len=1460 
    1204 7.943985 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] ddi-tcp-1 > 60781 [ACK] Seq=117486 Ack=8129 Win=65535 Len=1460 
    1205 7.943995 192.168.11.121  192.168.11.16   TCP  60781 > ddi-tcp-1 [ACK] Seq=8129 Ack=118946 Win=65700 Len=0 SLE=132086 SRE=132402 
    1206 7.944665 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] ddi-tcp-1 > 60781 [ACK] Seq=118946 Ack=8129 Win=65535 Len=1460 
    1207 7.944667 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] ddi-tcp-1 > 60781 [ACK] Seq=120406 Ack=8129 Win=65535 Len=1460 
    1208 7.944681 192.168.11.121  192.168.11.16   TCP  60781 > ddi-tcp-1 [ACK] Seq=8129 Ack=121866 Win=65700 Len=0 SLE=132086 SRE=132402 
    1209 7.944999 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] ddi-tcp-1 > 60781 [ACK] Seq=121866 Ack=8129 Win=65535 Len=1460 
    1210 7.945002 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] ddi-tcp-1 > 60781 [ACK] Seq=123326 Ack=8129 Win=65535 Len=1460 
    1211 7.945004 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] ddi-tcp-1 > 60781 [ACK] Seq=124786 Ack=8129 Win=65535 Len=1460 
    1212 7.945018 192.168.11.121  192.168.11.16   TCP  60781 > ddi-tcp-1 [ACK] Seq=8129 Ack=126246 Win=65700 Len=0 SLE=132086 SRE=132402 
    1213 7.945330 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] ddi-tcp-1 > 60781 [ACK] Seq=126246 Ack=8129 Win=65535 Len=1460 
    1214 7.945333 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] ddi-tcp-1 > 60781 [ACK] Seq=127706 Ack=8129 Win=65535 Len=1460 
    1215 7.945344 192.168.11.121  192.168.11.16   TCP  60781 > ddi-tcp-1 [ACK] Seq=8129 Ack=129166 Win=65700 Len=0 SLE=132086 SRE=132402 
    1216 7.945664 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] ddi-tcp-1 > 60781 [ACK] Seq=129166 Ack=8129 Win=65535 Len=1460 
    1217 7.945667 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] ddi-tcp-1 > 60781 [ACK] Seq=130626 Ack=8129 Win=65535 Len=1460 
    1218 7.945669 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] ddi-tcp-1 > 60781 [PSH, ACK] Seq=132086 Ack=8129 Win=65535 Len=316 
    1219 7.945686 192.168.11.121  192.168.11.16   TCP  60781 > ddi-tcp-1 [ACK] Seq=8129 Ack=132402 Win=65700 Len=0 
    1220 7.945692 192.168.11.121  192.168.11.16   TCP  [TCP Dup ACK 1219#1] 60781 > ddi-tcp-1 [ACK] Seq=8129 Ack=132402 Win=65700 Len=0 SLE=132086 SRE=132402 
    1223 8.038426 192.168.11.121  192.168.11.16   TCP  60781 > ddi-tcp-1 [PSH, ACK] Seq=8129 Ack=132402 Win=65700 Len=1016 
    1224 8.040480 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=132402 Ack=9145 Win=64519 Len=1460 
    1225 8.040482 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=133862 Ack=9145 Win=64519 Len=1460 
    1226 8.040499 192.168.11.121  192.168.11.16   TCP  60781 > ddi-tcp-1 [ACK] Seq=9145 Ack=135322 Win=65700 Len=0 
    1227 8.040813 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=135322 Ack=9145 Win=64519 Len=1460 
    1228 8.040815 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=136782 Ack=9145 Win=64519 Len=1460 
    1229 8.040817 192.168.11.16   192.168.11.121  TCP  ddi-tcp-1 > 60781 [ACK] Seq=138242 Ack=9145 Win=64519 Len=1460 
    1230 8.040830 192.168.11.121  192.168.11.16   TCP  60781 > ddi-tcp-1 [ACK] Seq=9145 Ack=139702 Win=65700 Len=0

我看到相同的行为在此服务器上下载从IIS图片：在服务器端（192.168.11.16）

No.  Time  Source    Destination   Protocol Info 
    287 22.257956 192.168.11.121  192.168.11.16   TCP  49387 > http [PSH, ACK] Seq=4531 Ack=86993 Win=65700 Len=869 
    288 22.261529 192.168.11.16   192.168.11.121  TCP  http > 49387 [ACK] Seq=86993 Ack=5400 Win=65535 Len=1460 
    289 22.261532 192.168.11.16   192.168.11.121  TCP  http > 49387 [ACK] Seq=88453 Ack=5400 Win=65535 Len=1460 
    290 22.261859 192.168.11.16   192.168.11.121  TCP  http > 49387 [ACK] Seq=89913 Ack=5400 Win=65535 Len=1460 
    291 22.261861 192.168.11.16   192.168.11.121  TCP  http > 49387 [ACK] Seq=91373 Ack=5400 Win=65535 Len=1460 
    292 22.261864 192.168.11.16   192.168.11.121  TCP  http > 49387 [ACK] Seq=92833 Ack=5400 Win=65535 Len=1460 
    293 22.262194 192.168.11.16   192.168.11.121  TCP  http > 49387 [ACK] Seq=94293 Ack=5400 Win=65535 Len=1460 
    294 22.262196 192.168.11.16   192.168.11.121  TCP  http > 49387 [ACK] Seq=95753 Ack=5400 Win=65535 Len=1460 
    295 22.262526 192.168.11.16   192.168.11.121  TCP  http > 49387 [ACK] Seq=97213 Ack=5400 Win=65535 Len=1460 
    296 22.262527 192.168.11.16   192.168.11.121  TCP  http > 49387 [ACK] Seq=98673 Ack=5400 Win=65535 Len=1460 
    297 22.262530 192.168.11.16   192.168.11.121  TCP  http > 49387 [ACK] Seq=100133 Ack=5400 Win=65535 Len=1460 
    298 22.262858 192.168.11.16   192.168.11.121  TCP  http > 49387 [ACK] Seq=101593 Ack=5400 Win=65535 Len=1460 
    299 22.262860 192.168.11.16   192.168.11.121  TCP  http > 49387 [ACK] Seq=103053 Ack=5400 Win=65535 Len=1460 
    300 22.263193 192.168.11.16   192.168.11.121  TCP  http > 49387 [ACK] Seq=104513 Ack=5400 Win=65535 Len=1460 
    301 22.263196 192.168.11.16   192.168.11.121  TCP  http > 49387 [ACK] Seq=105973 Ack=5400 Win=65535 Len=1460 
    302 22.263197 192.168.11.16   192.168.11.121  TCP  http > 49387 [ACK] Seq=107433 Ack=5400 Win=65535 Len=1460 
    303 22.263530 192.168.11.16   192.168.11.121  TCP  http > 49387 [ACK] Seq=108893 Ack=5400 Win=65535 Len=1460 
    304 22.263532 192.168.11.16   192.168.11.121  TCP  http > 49387 [ACK] Seq=110353 Ack=5400 Win=65535 Len=1460 
    305 22.263534 192.168.11.16   192.168.11.121  TCP  http > 49387 [ACK] Seq=111813 Ack=5400 Win=65535 Len=1460 
    306 22.263863 192.168.11.16   192.168.11.121  TCP  http > 49387 [ACK] Seq=113273 Ack=5400 Win=65535 Len=1460 
    307 22.263865 192.168.11.16   192.168.11.121  TCP  http > 49387 [ACK] Seq=114733 Ack=5400 Win=65535 Len=1460 
    308 22.264196 192.168.11.16   192.168.11.121  TCP  http > 49387 [ACK] Seq=116193 Ack=5400 Win=65535 Len=1460 
    309 22.264198 192.168.11.16   192.168.11.121  TCP  http > 49387 [ACK] Seq=117653 Ack=5400 Win=65535 Len=1460 
    310 22.264200 192.168.11.16   192.168.11.121  TCP  http > 49387 [ACK] Seq=119113 Ack=5400 Win=65535 Len=1460 
    311 22.264528 192.168.11.16   192.168.11.121  TCP  http > 49387 [ACK] Seq=120573 Ack=5400 Win=65535 Len=1460 
    312 22.264531 192.168.11.16   192.168.11.121  TCP  http > 49387 [ACK] Seq=122033 Ack=5400 Win=65535 Len=1460 
    313 22.264533 192.168.11.16   192.168.11.121  TCP  http > 49387 [ACK] Seq=123493 Ack=5400 Win=65535 Len=1460 
    314 22.264859 192.168.11.16   192.168.11.121  TCP  http > 49387 [PSH, ACK] Seq=124953 Ack=5400 Win=65535 Len=928 
    315 22.264886 192.168.11.121  192.168.11.16   TCP  [TCP Dup ACK 287#1] 49387 > http [ACK] Seq=5400 Ack=86993 Win=65700 Len=0 SLE=124953 SRE=125881 
    324 22.459724 192.168.11.16   192.168.11.121  TCP  [TCP Dup ACK 314#1] http > 49387 [ACK] Seq=125881 Ack=5400 Win=65535 Len=0 
    326 22.788166 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] http > 49387 [ACK] Seq=86993 Ack=5400 Win=65535 Len=1460 
    330 22.980324 192.168.11.121  192.168.11.16   TCP  49387 > http [ACK] Seq=5400 Ack=88453 Win=65700 Len=0 SLE=124953 SRE=125881 
    331 22.981699 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] http > 49387 [ACK] Seq=88453 Ack=5400 Win=65535 Len=1460 
    332 22.981703 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] http > 49387 [ACK] Seq=89913 Ack=5400 Win=65535 Len=1460 
    333 22.981755 192.168.11.121  192.168.11.16   TCP  49387 > http [ACK] Seq=5400 Ack=91373 Win=65700 Len=0 SLE=124953 SRE=125881 
    334 22.983025 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] http > 49387 [ACK] Seq=91373 Ack=5400 Win=65535 Len=1460 
    335 22.983028 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] http > 49387 [ACK] Seq=92833 Ack=5400 Win=65535 Len=1460 
    336 22.983034 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] http > 49387 [ACK] Seq=94293 Ack=5400 Win=65535 Len=1460 
    337 22.983085 192.168.11.121  192.168.11.16   TCP  49387 > http [ACK] Seq=5400 Ack=95753 Win=65700 Len=0 SLE=124953 SRE=125881 
    338 22.984287 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] http > 49387 [ACK] Seq=95753 Ack=5400 Win=65535 Len=1460 
    339 22.984290 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] http > 49387 [ACK] Seq=97213 Ack=5400 Win=65535 Len=1460 
    340 22.984292 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] http > 49387 [ACK] Seq=98673 Ack=5400 Win=65535 Len=1460 
    341 22.984294 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] http > 49387 [ACK] Seq=100133 Ack=5400 Win=65535 Len=1460 
    342 22.984339 192.168.11.121  192.168.11.16   TCP  49387 > http [ACK] Seq=5400 Ack=101593 Win=65700 Len=0 SLE=124953 SRE=125881 
    343 22.985373 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] http > 49387 [ACK] Seq=101593 Ack=5400 Win=65535 Len=1460 
    344 22.985377 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] http > 49387 [ACK] Seq=103053 Ack=5400 Win=65535 Len=1460 
    345 22.985382 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] http > 49387 [ACK] Seq=104513 Ack=5400 Win=65535 Len=1460 
    346 22.985435 192.168.11.121  192.168.11.16   TCP  49387 > http [ACK] Seq=5400 Ack=105973 Win=65700 Len=0 SLE=124953 SRE=125881 
    347 22.985706 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] http > 49387 [ACK] Seq=105973 Ack=5400 Win=65535 Len=1460 
    348 22.985710 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] http > 49387 [ACK] Seq=107433 Ack=5400 Win=65535 Len=1460 
    349 22.985753 192.168.11.121  192.168.11.16   TCP  49387 > http [ACK] Seq=5400 Ack=108893 Win=65700 Len=0 SLE=124953 SRE=125881 
    350 22.986436 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] http > 49387 [ACK] Seq=108893 Ack=5400 Win=65535 Len=1460 
    351 22.986438 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] http > 49387 [ACK] Seq=110353 Ack=5400 Win=65535 Len=1460 
    352 22.986459 192.168.11.121  192.168.11.16   TCP  49387 > http [ACK] Seq=5400 Ack=111813 Win=65700 Len=0 SLE=124953 SRE=125881 
    353 22.987002 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] http > 49387 [ACK] Seq=111813 Ack=5400 Win=65535 Len=1460 
    354 22.987005 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] http > 49387 [ACK] Seq=113273 Ack=5400 Win=65535 Len=1460 
    355 22.987011 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] http > 49387 [ACK] Seq=114733 Ack=5400 Win=65535 Len=1460 
    356 22.987013 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] http > 49387 [ACK] Seq=116193 Ack=5400 Win=65535 Len=1460 
    357 22.987064 192.168.11.121  192.168.11.16   TCP  49387 > http [ACK] Seq=5400 Ack=117653 Win=65700 Len=0 SLE=124953 SRE=125881 
    358 22.987174 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] http > 49387 [ACK] Seq=117653 Ack=5400 Win=65535 Len=1460 
    359 22.987741 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] http > 49387 [ACK] Seq=119113 Ack=5400 Win=65535 Len=1460 
    360 22.987744 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] http > 49387 [ACK] Seq=120573 Ack=5400 Win=65535 Len=1460 
    361 22.987747 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] http > 49387 [ACK] Seq=122033 Ack=5400 Win=65535 Len=1460 
    362 22.987805 192.168.11.121  192.168.11.16   TCP  49387 > http [ACK] Seq=5400 Ack=123493 Win=65700 Len=0 SLE=124953 SRE=125881 
    363 22.988171 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] http > 49387 [ACK] Seq=123493 Ack=5400 Win=65535 Len=1460 
    364 22.988175 192.168.11.16   192.168.11.121  TCP  [TCP Retransmission] http > 49387 [PSH, ACK] Seq=124953 Ack=5400 Win=65535 Len=928 
    365 22.988219 192.168.11.121  192.168.11.16   TCP  49387 > http [ACK] Seq=5400 Ack=125881 Win=65700 Len=0 
    366 22.988236 192.168.11.121  192.168.11.16   TCP  [TCP Dup ACK 365#1] 49387 > http [ACK] Seq=5400 Ack=125881 Win=65700 Len=0 SLE=124953 SRE=125881 
    409 25.633275 192.168.11.121  192.168.11.16   TCP  49387 > http [PSH, ACK] Seq=5400 Ack=125881 Win=65700 Len=990

来源

2011-12-21 Debby Mendez

回答

1

您已经运行监控程序，对不对？ 所以你不直接看到客户端收到了什么数据包。

但包号1183（从客户192.168.11.121选择性ACK）告诉所有我们需要的：

客户从开始到99966，并132086-132401承认字节。 客户端未收到数据包1160-1181。分组1156和1182被接收。因此，ack 1183由分组1182触发。

问题不在服务器或客户端应用程序中。 有很多可能的原因，主机之间为什么丢包1160-1181。

我们只能启动quessing：

两种捕捉的问题似乎是韦里类似：只有最后一个（小）数据包通过不重传。所以这可能是某种PMTU和“不分片”的问题。或者只是一个坏了的网卡或交换机。

来源

2011-12-22 19:07:33 SKi

+0

谢谢 - 你已经帮我指点了SLE/SRE字段。这是一个客户端跟踪（我注意到了，但很容易错过）。所以现在的问题是，如果1160-1181在客户端的WireShark中出现，客户怎么没有确认它们？ – 2011-12-23 16:59:51

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