这就是我所拥有的：
客户端（192.168.11.121）：Windows Vista，Firefox
服务器端（192.168.11.16）：Windows 2003，我的Web服务器或IIS
在客户端上运行的Fiddler显示，即使图像大小相同，某些图像的下载时间也要比其他图像长得多。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。下面的第一条曲线包含成功和慢速请求。
成功的图片请求： 1132是来自浏览器的图像请求 1133-1155是回应。当服务器发送数据包时，客户端在它们到达时对它们进行确认
带有重新传输的图像请求： 1159是来自浏览器的图像请求 1160-1182是回应。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确认 - 为什么？
我已经读过有关延迟的ACK，但我不认为这些条件适用，因为客户端应该至少在每个其他数据包上执行一次，对吗？
客户是否认为丢失了数据包，因此没有发送消息？丢包了吗？如果是这样，我看不到它。
我已经尝试了2台带有此服务器的客户机 - 两者都有问题。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。所以我认为这是服务器方面的问题，但是什么呢？
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
我看到在此服务器上从IIS下载图像的行为相同：
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
答案 0 :(得分：1)
您已在服务器端运行监控程序（192.168.11.16），对吗？ 因此，您不直接查看客户端收到的数据包。
但是数据包编号1183（来自客户端192.168.11.121的选择性确认）告诉我们所需要的所有内容：
客户端确认从开始到99966和132086-132401的字节。 客户端未收到数据包1160-1181。收到的数据包1156和1182。所以ack 1183由数据包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，为什么数据包1160-1181在主机之间丢失。
我们只能开始讨论：
两个捕获的问题似乎都很相似：只有最后一个（较小的）数据包没有重新传输。所以这可能是某种PMTU和'不碎片'的问题。或者只是一个坏的NIC或交换机。