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发表于 2007-12-06 13:25 |只看该作者 |倒序浏览

基于TCP的C/S 架构在网络通讯中的一个问题，本人已经黔驴技穷了，请各位大侠帮忙??????

架构基本描述：
1.我的程序是C/S架构
2.传输基于tcp协议
3.传输的基本方式是一应一答式或一应多答式。
  比如:
         客户端请求把我的好友传过来，这时服务器把好友传送给客户端，如果好友少或没有，只有一个回应包，
         如果好友比较多，可能会有连续多个回应包。

具体情形描述：
1.这种架构在局域网内工作非常正常(无论数据多少)，没有任何问题。
2.这种架构放在广域网上运行之后，发现某些帐号有时候无法成功获取数据。综合分析后发现这些帐号数据量都
  比较大，可以简单地理解为好友数量比较多。
3.无法获取数据的这些帐号，在重试几次之后可以拿到全部数据(也就是断开连接，重新连接，这样几次以后)。
4.有时候这些帐号也能够正常登录。
5.发生这种情况时，虽然服务器底层的数据包发不出去(感觉是网卡)，但客户端发给服务器心跳包却能够正常过来。
  通过ethereal抓包的分析来看是，是"TCP Previous segment lost"，我发现只要出现传送数据无法到达的客户
  端的情况，在客户端用ethereal分析，一定会有"TCP Previous segment lost"这个错误，为什么呢？

问题发生时的抓包结果：
1.在问题发生时，在服务器上抓包(使用ngrep抓包工具)，发现服务器不停地重试发送特定的数据包，而且每都是
  同样的数据包，好象这些包发不出去(但我的服务器调用write函数显示成功发出去了)。以下是用ngrep工具在服
  务器上的抓包结果：
  注：59.108.72.10:3071是我客户端的公网出口
   124.42.10.227是我服务器的ip,7002是我服务器监听的端口
   你可以看到底层在不停地重发同样的数据包。

客户端->服务器的心跳包，这个包服务器可以正常收到
T 2007/12/06 13:06:01.482598 59.108.72.10:3071 -> 124.42.10.227:7002 [AP]
  00 00 0f 27                                        ...'

服务器->客户端的数据包(并没有真正发出去，好象一直在重试)
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

客户端->服务器的心跳包，这个包服务器可以正常收到
T 2007/12/06 13:06:31.479342 59.108.72.10:3071 -> 124.42.10.227:7002 [AP]
  00 00 0f 27                                        ...'

服务器->客户端的数据包(并没有真正发出去，好象一直在重试)
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

客户端->服务器的心跳包，这个包服务器可以正常收到
T 2007/12/06 13:07:01.472723 59.108.72.10:3071 -> 124.42.10.227:7002 [AP]
  00 00 0f 27                                        ...'

客户端->服务器的心跳包，这个包服务器可以正常收到
T 2007/12/06 13:07:31.469546 59.108.72.10:3071 -> 124.42.10.227:7002 [AP]
  00 00 0f 27                                        ...'

服务器->客户端的数据包(并没有真正发出去，好象一直在重试)
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 编辑 ]

文库|博客

hardboy_du

丰衣足食

论坛徽章:: 0

2楼 [报告]

发表于 2007-12-06 13:26 |只看该作者

客户端->服务器的心跳包，这个包服务器可以正常收到
T 2007/12/06 13:08:01.466814 59.108.72.10:3071 -> 124.42.10.227:7002 [AP]
  00 00 0f 27                                        ...'

客户端->服务器的心跳包，这个包服务器可以正常收到
T 2007/12/06 13:08:31.461990 59.108.72.10:3071 -> 124.42.10.227:7002 [AP]
  00 00 0f 27                                        ...'

2.问题发生时，在客户端抓包(使用ethereal工具)，发现类似以下错误(这是上下文的包，用ethereal导出来的)：
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. 我很想知道问题发生的原因及解决方法。
4. 非常感谢诸位大侠的帮助!

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基于TCP的C/S 架构在网络通讯中的一个问题，请各位大侠帮忙?????? [复制链接]