基于TCP的C/S 架構(gòu)在網(wǎng)絡(luò)通訊中的一個(gè)問(wèn)題，請(qǐng)各位大俠幫忙??????

hardboy_du

基于TCP的C/S 架構(gòu)在網(wǎng)絡(luò)通訊中的一個(gè)問(wèn)題，本人已經(jīng)黔驢技窮了，請(qǐng)各位大俠幫忙??????

架構(gòu)基本描述：
1.我的程序是C/S架構(gòu)
2.傳輸基于tcp協(xié)議
3.傳輸?shù)幕�本方式是一�?yīng)一答式或一應(yīng)多答式。
  比如:
            客戶(hù)端請(qǐng)求把我的好友傳過(guò)來(lái)，這時(shí)服務(wù)器把好友傳送給客戶(hù)端，如果好友少或沒(méi)有，只有一個(gè)回應(yīng)包，
            如果好友比較多，可能會(huì)有連續(xù)多個(gè)回應(yīng)包。
            
具體情形描述：
1.這種架構(gòu)在局域網(wǎng)內(nèi)工作非常正常(無(wú)論數(shù)據(jù)多少)，沒(méi)有任何問(wèn)題。
2.這種架構(gòu)放在廣域網(wǎng)上運(yùn)行之后，發(fā)現(xiàn)某些帳號(hào)有時(shí)候無(wú)法成功獲取數(shù)據(jù)。綜合分析后發(fā)現(xiàn)這些帳號(hào)數(shù)據(jù)量都
  比較大，可以簡(jiǎn)單地理解為好友數(shù)量比較多。
3.無(wú)法獲取數(shù)據(jù)的這些帳號(hào)，在重試幾次之后可以拿到全部數(shù)據(jù)(也就是斷開(kāi)連接，重新連接，這樣幾次以后)。
4.有時(shí)候這些帳號(hào)也能夠正常登錄。
5.發(fā)生這種情況時(shí)，雖然服務(wù)器底層的數(shù)據(jù)包發(fā)不出去(感覺(jué)是網(wǎng)卡)，但客戶(hù)端發(fā)給服務(wù)器心跳包卻能夠正常過(guò)來(lái)。
  通過(guò)ethereal抓包的分析來(lái)看是，是"TCP Previous segment lost"，我發(fā)現(xiàn)只要出現(xiàn)傳送數(shù)據(jù)無(wú)法到達(dá)的客戶(hù)
  端的情況，在客戶(hù)端用ethereal分析，一定會(huì)有"TCP Previous segment lost"這個(gè)錯(cuò)誤，為什么呢？

問(wèn)題發(fā)生時(shí)的抓包結(jié)果：
1.在問(wèn)題發(fā)生時(shí)，在服務(wù)器上抓包(使用ngrep抓包工具)，發(fā)現(xiàn)服務(wù)器不停地重試發(fā)送特定的數(shù)據(jù)包，而且每都是
  同樣的數(shù)據(jù)包，好象這些包發(fā)不出去(但我的服務(wù)器調(diào)用write函數(shù)顯示成功發(fā)出去了)。以下是用ngrep工具在服
  務(wù)器上的抓包結(jié)果：
  注：59.108.72.10:3071是我客戶(hù)端的公網(wǎng)出口
      124.42.10.227是我服務(wù)器的ip,7002是我服務(wù)器監(jiān)聽(tīng)的端口
      你可以看到底層在不停地重發(fā)同樣的數(shù)據(jù)包。
      
客戶(hù)端->服務(wù)器的心跳包，這個(gè)包服務(wù)器可以正常收到
T 2007/12/06 13:06:01.482598 59.108.72.10:3071 -> 124.42.10.227:7002 [AP]
  00 00 0f 27                                           ...'            

服務(wù)器->客戶(hù)端的數(shù)據(jù)包(并沒(méi)有真正發(fā)出去，好象一直在重試)
T 2007/12/06 13:06:10.516008 124.42.10.227:7002 -> 59.108.72.10:3071 [AP]
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 32    ..............12
  32 35 32 31 18 00 c7 1f    02 00 bb 00 03 00 06 00    2521............
  88 00 31 32 32 35 32 31    04 00 ba 00 1f 83 57 47    ..122521......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 32    ..............12
  32 35 32 30 18 00 c7 1f    02 00 bb 00 03 00 06 00    2520............
  88 00 31 32 32 35 32 30    04 00 ba 00 1f 83 57 47    ..122520......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 32    ..............12
  32 35 31 38 18 00 c7 1f    02 00 bb 00 03 00 06 00    2518............
  88 00 31 32 32 35 31 38    04 00 ba 00 1f 83 57 47    ..122518......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 32    ..............12
  30 37 34 32 18 00 c7 1f    02 00 bb 00 03 00 06 00    0742............
  88 00 31 32 30 37 34 32    04 00 ba 00 1f 83 57 47    ..120742......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 31    ..............11
  35 30 33 30 18 00 c7 1f    02 00 bb 00 03 00 06 00    5030............
  88 00 31 31 35 30 33 30    04 00 ba 00 1f 83 57 47    ..115030......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 31    ..............11
  35 30 32 39 18 00 c7 1f    02 00 bb 00 03 00 06 00    5029............
  88 00 31 31 35 30 32 39    04 00 ba 00 1f 83 57 47    ..115029......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 31    ..............11
  35 30 32 38 18 00 c7 1f    02 00 bb 00 03 00 06 00    5028............
  88 00 31 31 35 30 32 38    04 00 ba 00 1f 83 57 47    ..115028......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 32    ..............12
  32 33 38 30 18 00 c7 1f    02 00 bb 00 03 00 06 00    2380............
  88 00 31 32 32 33 38 30    04 00 ba 00 1f 83 57 47    ..122380......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 32    ..............12
  32 33 37 39 18 00 c7 1f    02 00 bb 00 03 00 06 00    2379............
  88 00 31 32 32 33 37 39    04 00 ba 00 1f 83 57 47    ..122379......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 32    ..............12
  32 33 37 38 18 00 c7 1f    02 00 bb 00 03 00 06 00    2378............
  88 00 31 32 32 33 37 38    04 00 ba 00 1f 83 57 47    ..122378......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 31    ..............11
  32 37 38 30 18 00 c7 1f    02 00 bb 00 03 00 06 00    2780............
  88 00 31 31 32 37 38 30    04 00 ba 00 1f 83 57 47    ..112780......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 31    ..............11
  32 37 36 39 18 00 c7 1f    02 00 bb 00 03 00 06 00    2769............
  88 00 31 31 32 37 36 39    04 00 ba 00 1f 83 57 47    ..112769......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 31    ..............11
  32 37 36 38 18 00 c7 1f    02 00 bb 00 03 00 06 00    2768............
  88 00 31 31 32 37 36 38    04 00 ba 00 1f 83 57 47    ..112768......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 31    ..............11
  32 37 36 36 18 00 c7 1f    02 00 bb 00 03 00 06 00    2766............
  88 00 31 31 32 37 36 36    04 00 ba 00 1f 83 57 47    ..112766......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 31    ..............11
  32 37 36 37 18 00 c7 1f    02 00 bb 00 03 00 06 00    2767............
  88 00 31 31 32 37 36 37    04 00 ba 00 1f 83 57 47    ..112767......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 31    ..............11
  33 34 37 37 18 00 c7 1f    02 00 bb 00 03 00 06 00    3477............
  88 00 31 31 33 34 37 37    04 00 ba 00 1f 83 57 47    ..113477......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 31    ..............11
  31 32 38 33 18 00 c7 1f    02 00 bb 00 03 00 06 00    1283............
  88 00 31 31 31 32 38 33    04 00 ba 00 1f 83 57 47    ..111283......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 31    ..............11
  32 32 35 33 18 00 c7 1f    02 00 bb 00 03 00 06 00    2253............
  88 00 31 31 32 32 35 33    04 00 ba 00 1f 83 57 47    ..112253......WG

客戶(hù)端->服務(wù)器的心跳包，這個(gè)包服務(wù)器可以正常收到
T 2007/12/06 13:06:31.479342 59.108.72.10:3071 -> 124.42.10.227:7002 [AP]
  00 00 0f 27                                           ...'            

服務(wù)器->客戶(hù)端的數(shù)據(jù)包(并沒(méi)有真正發(fā)出去，好象一直在重試)
T 2007/12/06 13:06:45.710401 124.42.10.227:7002 -> 59.108.72.10:3071 [AP]
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 32    ..............12
  32 35 32 31 18 00 c7 1f    02 00 bb 00 03 00 06 00    2521............
  88 00 31 32 32 35 32 31    04 00 ba 00 1f 83 57 47    ..122521......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 32    ..............12
  32 35 32 30 18 00 c7 1f    02 00 bb 00 03 00 06 00    2520............
  88 00 31 32 32 35 32 30    04 00 ba 00 1f 83 57 47    ..122520......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 32    ..............12
  32 35 31 38 18 00 c7 1f    02 00 bb 00 03 00 06 00    2518............
  88 00 31 32 32 35 31 38    04 00 ba 00 1f 83 57 47    ..122518......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 32    ..............12
  30 37 34 32 18 00 c7 1f    02 00 bb 00 03 00 06 00    0742............
  88 00 31 32 30 37 34 32    04 00 ba 00 1f 83 57 47    ..120742......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 31    ..............11
  35 30 33 30 18 00 c7 1f    02 00 bb 00 03 00 06 00    5030............
  88 00 31 31 35 30 33 30    04 00 ba 00 1f 83 57 47    ..115030......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 31    ..............11
  35 30 32 39 18 00 c7 1f    02 00 bb 00 03 00 06 00    5029............
  88 00 31 31 35 30 32 39    04 00 ba 00 1f 83 57 47    ..115029......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 31    ..............11
  35 30 32 38 18 00 c7 1f    02 00 bb 00 03 00 06 00    5028............
  88 00 31 31 35 30 32 38    04 00 ba 00 1f 83 57 47    ..115028......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 32    ..............12
  32 33 38 30 18 00 c7 1f    02 00 bb 00 03 00 06 00    2380............
  88 00 31 32 32 33 38 30    04 00 ba 00 1f 83 57 47    ..122380......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 32    ..............12
  32 33 37 39 18 00 c7 1f    02 00 bb 00 03 00 06 00    2379............
  88 00 31 32 32 33 37 39    04 00 ba 00 1f 83 57 47    ..122379......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 32    ..............12
  32 33 37 38 18 00 c7 1f    02 00 bb 00 03 00 06 00    2378............
  88 00 31 32 32 33 37 38    04 00 ba 00 1f 83 57 47    ..122378......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 31    ..............11
  32 37 38 30 18 00 c7 1f    02 00 bb 00 03 00 06 00    2780............
  88 00 31 31 32 37 38 30    04 00 ba 00 1f 83 57 47    ..112780......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 31    ..............11
  32 37 36 39 18 00 c7 1f    02 00 bb 00 03 00 06 00    2769............
  88 00 31 31 32 37 36 39    04 00 ba 00 1f 83 57 47    ..112769......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 31    ..............11
  32 37 36 38 18 00 c7 1f    02 00 bb 00 03 00 06 00    2768............
  88 00 31 31 32 37 36 38    04 00 ba 00 1f 83 57 47    ..112768......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 31    ..............11
  32 37 36 36 18 00 c7 1f    02 00 bb 00 03 00 06 00    2766............
  88 00 31 31 32 37 36 36    04 00 ba 00 1f 83 57 47    ..112766......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 31    ..............11
  32 37 36 37 18 00 c7 1f    02 00 bb 00 03 00 06 00    2767............
  88 00 31 31 32 37 36 37    04 00 ba 00 1f 83 57 47    ..112767......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 31    ..............11
  33 34 37 37 18 00 c7 1f    02 00 bb 00 03 00 06 00    3477............
  88 00 31 31 33 34 37 37    04 00 ba 00 1f 83 57 47    ..113477......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 31    ..............11
  31 32 38 33 18 00 c7 1f    02 00 bb 00 03 00 06 00    1283............
  88 00 31 31 31 32 38 33    04 00 ba 00 1f 83 57 47    ..111283......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 31    ..............11
  32 32 35 33 18 00 c7 1f    02 00 bb 00 03 00 06 00    2253............
  88 00 31 31 32 32 35 33    04 00 ba 00 1f 83 57 47    ..112253......WG

客戶(hù)端->服務(wù)器的心跳包，這個(gè)包服務(wù)器可以正常收到
T 2007/12/06 13:07:01.472723 59.108.72.10:3071 -> 124.42.10.227:7002 [AP]
  00 00 0f 27                                           ...'            

客戶(hù)端->服務(wù)器的心跳包，這個(gè)包服務(wù)器可以正常收到
T 2007/12/06 13:07:31.469546 59.108.72.10:3071 -> 124.42.10.227:7002 [AP]
  00 00 0f 27                                           ...'            

服務(wù)器->客戶(hù)端的數(shù)據(jù)包(并沒(méi)有真正發(fā)出去，好象一直在重試)
T 2007/12/06 13:07:56.100015 124.42.10.227:7002 -> 59.108.72.10:3071 [AP]
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 32    ..............12
  32 35 32 31 18 00 c7 1f    02 00 bb 00 03 00 06 00    2521............
  88 00 31 32 32 35 32 31    04 00 ba 00 1f 83 57 47    ..122521......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 32    ..............12
  32 35 32 30 18 00 c7 1f    02 00 bb 00 03 00 06 00    2520............
  88 00 31 32 32 35 32 30    04 00 ba 00 1f 83 57 47    ..122520......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 32    ..............12
  32 35 31 38 18 00 c7 1f    02 00 bb 00 03 00 06 00    2518............
  88 00 31 32 32 35 31 38    04 00 ba 00 1f 83 57 47    ..122518......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 32    ..............12
  30 37 34 32 18 00 c7 1f    02 00 bb 00 03 00 06 00    0742............
  88 00 31 32 30 37 34 32    04 00 ba 00 1f 83 57 47    ..120742......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 31    ..............11
  35 30 33 30 18 00 c7 1f    02 00 bb 00 03 00 06 00    5030............
  88 00 31 31 35 30 33 30    04 00 ba 00 1f 83 57 47    ..115030......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 31    ..............11
  35 30 32 39 18 00 c7 1f    02 00 bb 00 03 00 06 00    5029............
  88 00 31 31 35 30 32 39    04 00 ba 00 1f 83 57 47    ..115029......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 31    ..............11
  35 30 32 38 18 00 c7 1f    02 00 bb 00 03 00 06 00    5028............
  88 00 31 31 35 30 32 38    04 00 ba 00 1f 83 57 47    ..115028......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 32    ..............12
  32 33 38 30 18 00 c7 1f    02 00 bb 00 03 00 06 00    2380............
  88 00 31 32 32 33 38 30    04 00 ba 00 1f 83 57 47    ..122380......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 32    ..............12
  32 33 37 39 18 00 c7 1f    02 00 bb 00 03 00 06 00    2379............
  88 00 31 32 32 33 37 39    04 00 ba 00 1f 83 57 47    ..122379......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 32    ..............12
  32 33 37 38 18 00 c7 1f    02 00 bb 00 03 00 06 00    2378............
  88 00 31 32 32 33 37 38    04 00 ba 00 1f 83 57 47    ..122378......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 31    ..............11
  32 37 38 30 18 00 c7 1f    02 00 bb 00 03 00 06 00    2780............
  88 00 31 31 32 37 38 30    04 00 ba 00 1f 83 57 47    ..112780......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 31    ..............11
  32 37 36 39 18 00 c7 1f    02 00 bb 00 03 00 06 00    2769............
  88 00 31 31 32 37 36 39    04 00 ba 00 1f 83 57 47    ..112769......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 31    ..............11
  32 37 36 38 18 00 c7 1f    02 00 bb 00 03 00 06 00    2768............
  88 00 31 31 32 37 36 38    04 00 ba 00 1f 83 57 47    ..112768......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 31    ..............11
  32 37 36 36 18 00 c7 1f    02 00 bb 00 03 00 06 00    2766............
  88 00 31 31 32 37 36 36    04 00 ba 00 1f 83 57 47    ..112766......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 31    ..............11
  32 37 36 37 18 00 c7 1f    02 00 bb 00 03 00 06 00    2767............
  88 00 31 31 32 37 36 37    04 00 ba 00 1f 83 57 47    ..112767......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 31    ..............11
  33 34 37 37 18 00 c7 1f    02 00 bb 00 03 00 06 00    3477............
  88 00 31 31 33 34 37 37    04 00 ba 00 1f 83 57 47    ..113477......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 31    ..............11
  31 32 38 33 18 00 c7 1f    02 00 bb 00 03 00 06 00    1283............
  88 00 31 31 31 32 38 33    04 00 ba 00 1f 83 57 47    ..111283......WG
  10 00 c7 1f 02 00 bb 00    01 00 06 00 88 00 31 31    ..............11
  32 32 35 33 18 00 c7 1f    02 00 bb 00 03 00 06 00    2253............
  88 00 31 31 32 32 35 33    04 00 ba 00 1f 83 57 47    ..112253......WG

<未完>

[ 本帖最后由 hardboy_du 于 2007-12-6 14:03 編輯 ]

hardboy_du

客戶(hù)端->服務(wù)器的心跳包，這個(gè)包服務(wù)器可以正常收到
T 2007/12/06 13:08:01.466814 59.108.72.10:3071 -> 124.42.10.227:7002 [AP]
  00 00 0f 27                                           ...'            

客戶(hù)端->服務(wù)器的心跳包，這個(gè)包服務(wù)器可以正常收到
T 2007/12/06 13:08:31.461990 59.108.72.10:3071 -> 124.42.10.227:7002 [AP]
  00 00 0f 27                                           ...'      
  
2.問(wèn)題發(fā)生時(shí)，在客戶(hù)端抓包(使用ethereal工具)，發(fā)現(xiàn)類(lèi)似以下錯(cuò)誤(這是上下文的包，用ethereal導(dǎo)出來(lái)的)：
Frame 14 (54 bytes on wire, 54 bytes captured)
Ethernet II, Src: Intel_29:9e:1f (00:16:76:29:9e:1f), Dst: Cisco-Li_41:68:6f (00:13:10:41:68:6f)
Internet Protocol, Src: 192.168.1.119 (192.168.1.119), Dst: 124.42.10.227 (124.42.10.227)
Transmission Control Protocol, Src Port: 3045 (3045), Dst Port: 7002 (7002), Seq: 35, Ack: 2916, Len: 0

No.     Time        Source                Destination           Protocol Info
     15 1.635271    192.168.1.119         124.42.10.227         TCP      [TCP segment of a reassembled PDU]

Frame 15 (72 bytes on wire, 72 bytes captured)
Ethernet II, Src: Intel_29:9e:1f (00:16:76:29:9e:1f), Dst: Cisco-Li_41:68:6f (00:13:10:41:68:6f)
Internet Protocol, Src: 192.168.1.119 (192.168.1.119), Dst: 124.42.10.227 (124.42.10.227)
Transmission Control Protocol, Src Port: 3045 (3045), Dst Port: 7002 (7002), Seq: 35, Ack: 2916, Len: 18

No.     Time        Source                Destination           Protocol Info
     16 1.725726    124.42.10.227         192.168.1.119         TCP      7002 > 3045 [ACK] Seq=2916 Ack=53 Win=5840 Len=0

Frame 16 (60 bytes on wire, 60 bytes captured)
Ethernet II, Src: Cisco-Li_41:68:6f (00:13:10:41:68:6f), Dst: Intel_29:9e:1f (00:16:76:29:9e:1f)
Internet Protocol, Src: 124.42.10.227 (124.42.10.227), Dst: 192.168.1.119 (192.168.1.119)
Transmission Control Protocol, Src Port: 7002 (7002), Dst Port: 3045 (3045), Seq: 2916, Ack: 53, Len: 0

No.     Time        Source                Destination           Protocol Info
     17 2.620349    124.42.10.227         192.168.1.119         TCP      [TCP segment of a reassembled PDU]

Frame 17 (1514 bytes on wire, 1514 bytes captured)
Ethernet II, Src: Cisco-Li_41:68:6f (00:13:10:41:68:6f), Dst: Intel_29:9e:1f (00:16:76:29:9e:1f)
Internet Protocol, Src: 124.42.10.227 (124.42.10.227), Dst: 192.168.1.119 (192.168.1.119)
Transmission Control Protocol, Src Port: 7002 (7002), Dst Port: 3045 (3045), Seq: 2916, Ack: 53, Len: 1460

No.     Time        Source                Destination           Protocol Info
     18 2.811532    192.168.1.119         124.42.10.227         TCP      3045 > 7002 [ACK] Seq=53 Ack=4376 Win=65535 Len=0

Frame 18 (54 bytes on wire, 54 bytes captured)
Ethernet II, Src: Intel_29:9e:1f (00:16:76:29:9e:1f), Dst: Cisco-Li_41:68:6f (00:13:10:41:68:6f)
Internet Protocol, Src: 192.168.1.119 (192.168.1.119), Dst: 124.42.10.227 (124.42.10.227)
Transmission Control Protocol, Src Port: 3045 (3045), Dst Port: 7002 (7002), Seq: 53, Ack: 4376, Len: 0

No.     Time        Source                Destination           Protocol Info
     19 2.867142    124.42.10.227         192.168.1.119         TCP      [TCP Previous segment lost] [TCP segment of a reassembled PDU]

Frame 19 (1514 bytes on wire, 1514 bytes captured)
Ethernet II, Src: Cisco-Li_41:68:6f (00:13:10:41:68:6f), Dst: Intel_29:9e:1f (00:16:76:29:9e:1f)
Internet Protocol, Src: 124.42.10.227 (124.42.10.227), Dst: 192.168.1.119 (192.168.1.119)
Transmission Control Protocol, Src Port: 7002 (7002), Dst Port: 3045 (3045), Seq: 7296, Ack: 53, Len: 1460

No.     Time        Source                Destination           Protocol Info
     20 2.867216    192.168.1.119         124.42.10.227         TCP      [TCP Dup ACK 18#1] 3045 > 7002 [ACK] Seq=53 Ack=4376 Win=65535 Len=0 SLE=7296 SRE=8756

Frame 20 (66 bytes on wire, 66 bytes captured)
Ethernet II, Src: Intel_29:9e:1f (00:16:76:29:9e:1f), Dst: Cisco-Li_41:68:6f (00:13:10:41:68:6f)
Internet Protocol, Src: 192.168.1.119 (192.168.1.119), Dst: 124.42.10.227 (124.42.10.227)
Transmission Control Protocol, Src Port: 3045 (3045), Dst Port: 7002 (7002), Seq: 53, Ack: 4376, Len: 0

No.     Time        Source                Destination           Protocol Info
     21 2.920235    124.42.10.227         192.168.1.119         TCP      [TCP Previous segment lost] [TCP segment of a reassembled PDU]

Frame 21 (1514 bytes on wire, 1514 bytes captured)
Ethernet II, Src: Cisco-Li_41:68:6f (00:13:10:41:68:6f), Dst: Intel_29:9e:1f (00:16:76:29:9e:1f)
Internet Protocol, Src: 124.42.10.227 (124.42.10.227), Dst: 192.168.1.119 (192.168.1.119)
Transmission Control Protocol, Src Port: 7002 (7002), Dst Port: 3045 (3045), Seq: 10216, Ack: 53, Len: 1460

No.     Time        Source                Destination           Protocol Info
     22 2.920306    192.168.1.119         124.42.10.227         TCP      [TCP Dup ACK 18#2] 3045 > 7002 [ACK] Seq=53 Ack=4376 Win=65535 Len=0 SLE=10216 SRE=11676 SLE=7296 SRE=8756

Frame 22 (74 bytes on wire, 74 bytes captured)
Ethernet II, Src: Intel_29:9e:1f (00:16:76:29:9e:1f), Dst: Cisco-Li_41:68:6f (00:13:10:41:68:6f)
Internet Protocol, Src: 192.168.1.119 (192.168.1.119), Dst: 124.42.10.227 (124.42.10.227)
Transmission Control Protocol, Src Port: 3045 (3045), Dst Port: 7002 (7002), Seq: 53, Ack: 4376, Len: 0

No.     Time        Source                Destination           Protocol Info
     23 2.976710    124.42.10.227         192.168.1.119         TCP      [TCP Retransmission] [TCP segment of a reassembled PDU]

Frame 23 (1514 bytes on wire, 1514 bytes captured)
Ethernet II, Src: Cisco-Li_41:68:6f (00:13:10:41:68:6f), Dst: Intel_29:9e:1f (00:16:76:29:9e:1f)
Internet Protocol, Src: 124.42.10.227 (124.42.10.227), Dst: 192.168.1.119 (192.168.1.119)
Transmission Control Protocol, Src Port: 7002 (7002), Dst Port: 3045 (3045), Seq: 4376, Ack: 53, Len: 1460

No.     Time        Source                Destination           Protocol Info
     24 3.113295    192.168.1.119         124.42.10.227         TCP      3045 > 7002 [ACK] Seq=53 Ack=5836 Win=65535 Len=0 SLE=10216 SRE=11676 SLE=7296 SRE=8756

Frame 24 (74 bytes on wire, 74 bytes captured)
Ethernet II, Src: Intel_29:9e:1f (00:16:76:29:9e:1f), Dst: Cisco-Li_41:68:6f (00:13:10:41:68:6f)
Internet Protocol, Src: 192.168.1.119 (192.168.1.119), Dst: 124.42.10.227 (124.42.10.227)
Transmission Control Protocol, Src Port: 3045 (3045), Dst Port: 7002 (7002), Seq: 53, Ack: 5836, Len: 0

No.     Time        Source                Destination           Protocol Info
     25 3.627296    124.42.10.227         192.168.1.119         TCP      [TCP Retransmission] [TCP segment of a reassembled PDU]

3. 我很想知道問(wèn)題發(fā)生的原因及解決方法。
4. 非常感謝諸位大俠的幫助!