基于Winpcap的网络嗅探器软件设计

论文通过调用winpcap库捕获本地网络上的所有数据包,然后对数据包进行协议解码,从而可以实时地监视网络。winpcap是Windows环境下的链路层网络访问的工业标准工具,它可以使应用程序绕过操作系统的协议栈去捕获和传输网络数据包,因此目前被广泛应用。     

网络文件传输机制探析

伴随着我们当前网络信息技术在日常生活中的普及,我们所需要的许多文件都是通过网络进行传输的。基于此,对网络文件的传输机制进行分析与探讨。首先对TCP以及UDP协议的相关理论进行了概括论述,继而分析了网络文件传输机制中的多线程技术应用问题,然后讨论了影响网络文件传输速度的多项因素,最后对全文进行了总结,以期能够对我国当前网络文件传输机制的不断完善提供一点可借鉴之处。     

现行比特流模式下的版权侵犯问题分析

2002年,美国人布莱姆·科亨(Bram Cohen)在网络上发表了首个比特流模式的下载软件——BitTorrent。比特流下载模式是架构于TCP/IP协议之上的一个P2P文件传输协议,处于TCP/IP结构的应用层。比特流本身也包含了一些具体的内容协议和扩展协议,直至目前,该模式仍在不断扩充中。作为一种基于P2P传输协议的     

机动突击中的自组网多路径路由技术

随着作战样式的变化和武器装备的变革,装甲车辆机动突击作战中协同控制的重要性 不断增强,对网络通信的各项性能指标提出了更高要求,而自组织网络所具备的一些优良特 性能够较好地适应这一需求。在网络通信中,稳定性是衡量网络路由性能的重要因素。机动 突击作战中,车辆移动、障碍物阻挡等因素将导致网络拓扑变化迅速,给路由稳定性带来严 重影响,极大地降低了网络通信质量。基于AODV协议,设计并仿真了一种链路不相交的多路 径被动式路由协议,以路由回复消息中携带的路由信息为基础,实现两条不相交链路作为通 信路由并互为备份。仿真结果表明,该协议在数据包到达率及平均时延方面较AODV协议均有 一定提高。     

文件传输FTP

文件传输(FTP)是Iternet上的一个重要功能,它可以把一台计算机上存储的文件传输到另一台计算机而不管这两台计算机距离多么遥远。这种服务能够快速高效地拷贝大量数据。 FTP简介 FTP(File Transfer Protocol)是文件传送协议的缩写。它是Internet上发展较早且稳定而有用的功能。常用的浏览器都支持FTP,也有专用FTP支持软件如Ws-Ftp,CuteFtp等。有了FTP,你就可以给你的主板、显卡下载最新的驱动程序,给你的杀毒软件加载最新的病毒数据库……。由于网上庞大的数据库资源,内容包罗万象,任何人都希望得到自己所需要的信息资源。只要选择其中你需要的,用FTP把它们传送到你的计算机中就可以了。     

MFlooding路由协议研究

本文深入分析了MFlooding路由协议,在传统的泛洪协议上引入了路由表的概念,用来减少数据包的重复发送,并通过NS-2对其性能进行了仿真,仿真结果显示在要求鲁棒性较高的ZigBee无线传感器网络中采用MFlooding协议有较好的性能。     

网络小常识

網络协议(Network Protocols) 网络协议是指计算机之间相互通信需要共同遵守的规则,它是针对计算机之间相互交换信息的方式、秩序以及参数所作出的规定。一台计算机只有在遵守某个协议的前提下才能在计算机网络上与其它计算机进行正常的通信。超文本傳输协议(HTTP) HTTP是WWW浏览器和WWW服务器之间的应用层通信协议。它是基于TCP/IP之上的协议,能够保证正确传输超文本文档,并且确定传输文档中首先显示的部分或某一部分中首先显示的内容。文件傳输协议(FTP) FTP是Internet使用非常广泛的一种通信协议,它是由支持Internet文件传输的各种规则所组成的集合。这些     

Vanguard SOTCP协议在卫星网中的应用

站点基于lP的应用（数据、话音、图像等全媒体的应用）提供通信支持。在业务接入的过程中需要通过Vanguard设备，把串口设备的数据转换成lP包，通过卫星小站的IP接口发送到其他的小站或是中心站i这样我们就需要使用Vanguard设备中的sOTCP协议与卫星网络进行互联。SOTCP协议是一个允许在Vanguard的lP网络中封装和传输串口协议的专属网络协议。主要功能和方法是实现IP网络中的每台终端用户都可以通过SOTCP协议进行互联。SOTCP协议可以提供可靠的串口设备路由到IP网络中的数据包转发机制串口数据的终端和封装都可以通过TCP／IP网络中传输、可以在一条TCP会话中建立多条交换虚电路．管理多条TCP会话。可以在源节点和目的节点之间提供高可靠的流量控制的传输机制     

基于排队论的战术通信混合接入方法

战术通信是为保障战斗指挥和战斗行动而建立的通信,在其协议设计时要更多考虑时延和可靠性因素。考虑到时分多址（Time Division Multiple Access,TDMA）组网协议是战术通信系统使用最广泛的协议,采用排队论的方法研究了TDMA协议对报文传输时延的影响,并提出一种TDMA和码分多址混合组网方法,在不降低网络吞吐量的前提下,大幅缩短数据包排队传输时延,〖JP2〗尤其在负载较高的场景优势更加明显。通过仿真结果和解析结果的比较,所提方法的排队时延分析可近似为不均衡队列的排队问题,因此从理论上能够证明所提方法能够减少排队时间。不同参数下的仿真结果表明,所提方法在排队时延和网络吞吐量等网络性能上较原TDMA方案有明显提升,验证了其有效性。     

基于状态相关字段识别的未知二进制协议状态机逆向方法

协议状态机逆构技术是分析未知协议行为逻辑的基本方法,是网络安全、信息对抗领域的一个重要研究方向。针对截获的未知二进制协议的通信数据,提出了一种二进制协议状态机逆向方法,该方法能够根据通信数据逆构协议状态转移图。在该方法中,设计了针对通信数据帧的基于多序列比对的对应字段对齐算法以及基于字段统计量分析的协议状态相关字段提取算法,并根据提取出的协议状态相关字段构建状态转换模型。在地址解析协议（ARP）和传输控制协议（TCP）上的实验结果表明该方法能够有效逆构出协议的状态转换模型。     

Brown＇s Blossom in Britain-China

The overall strategic relationship between U.K. and China is ＂better than ever＂, China- Britain relations have maintained good momentum, with increased high-level exchanges and the reinforcement of strategic mutual trust, with more room for growth in the future.     

Challenge and Opportunity Go Hand in Hand——What Global Economic Agitation Brings to the China's Economy?

Domino effects of the global finance agitation As the origin of the subprime crisis,US financial institutions lost USS45 billion last year,accounted for over half of the total US,EU & Japan loss.Since January 15th,Chtigroup released its financial statement of the 4th quarter,showing a net deficit of USS9.83 billion,which marked the hisoric high of its quarterly deficit.     

Sinosteel：Extraordinary Moves in Industry Chess

Among the Fortune 500 firms,more and more images from China emerge out.On the 2008 list,Sinosteel Corporation,a landmark group of China industries quietly squeezes into the candidate line.As the largest steel service ＆ trade enterprise,its sales reached at RMB 111.24 billion,with a year-on-year increase of 83.03 percent,and the profit grew by 180.03 percent.On the Sinosteel 2008 Work Meeting,the president Huang Tianwen uttered,＂In the coming year,we will work for US$20 billion sales,and look forward to getting a position in Fortune 500 firms for ourselves.＂     

Walk Through Unusual Five Years—— An Exhibitor＇s Canton Fair Course

When the 103rd Canton Fair is approaching, an old friend of Canton Fair, Li Ying from Jiangsu prov-ince recollected his past five years＇ experiences to the grand trade meeting. Each year is special, with some unforgettable memories colored by the year.     

Jean-Pierre Duprieu： Willing to Be A Legate of Sino-French Business

Estaing, former French president, Valery Giscard d＇Estaing attended Sino-French Economic Seminar held in Shanghai in early April and said that the world center has shifted from the west to the east with many European and US companies entering into Asia, and China has the ability to play an important role in the world stage. Estaing, naming himself＂French Confucian＂, then said in Chinese that a cook-group includes 10 people in ancient Chinese soldier system and the cook is in charge of cooking for them. And people who belong to the same cook are actually ＂Partners＂.     

China''''s Stock Market Wave

The annual meeting of the World Economy Forum was held in Davos,a little town in Switzerland,on January 23rd to the 27th this year,with the theme"the Power fo Collaborative Innovation",over 2500 celebrates from ture political and cconomic circles of more than 80 countries and challengred logether to talk about the future of the global economy in 2008,A Forum for the problems and challenges that face whole world,some of the keywords which drew attention during the event were:the U.S.subprime mortgage crisis,soaring energy prices,the economic slowdown in the U.S.ermerging economic bodies,authority funds and the general unpredictable nature of the global economy.     

Trade Promotion from Neighborhood

If you are considering to trade with companies in Japan or expanding your .business to Japan, we are ready to help from the very beginning.＂ You will find this greeting at the first sight on the Chinese website of Japan External Trade Organization （JETRO）. JETRO has committed itself in delivering highly efficient and quality services to meet the demand of internal and external customs including Japanese companies, hence winning a good reputation in the international trade arena. In recent years, with its priority in advancing business cooperation in South and East Asia, JETRO has made great achievement in promoting trade between China and Japan. Therefore, China＇s Foreign Trade interviewed Mr. Yoichi Maine, Deputy Director General of JETRO BEIJING.     

Auto Parts Market Potential Coming into Surface

Looking at the increasingly fierce competition in the world auto market. global automobile manufacturing industry, taking Europe, the U.S. and Japan as representatives, is gradually forming a new type of relationship, mutual cooperation between whole vehicle and parts manufacturers. We can clearly see that auto parts manufacturers have become independent from the whole vehicle manufacturing companies, which means that the former structure of auto industry has greatly changed, and a new relationship,     

Public Financial Expenditure——A Reflection of the Livelihood Improvement

In recent years.China's public finance put social construction high on the agenda and attaches more importance on livelihood insurance and improvement.The 2003-2007 public financial expenditure reflects a fact that the government isputting more emphasis on livelihood andissues concerning the people.     

Voices from the MPC and CPPCC

"Crucial for economic growth.energy utilization has its role in all economic sectors and every aspect of people's daily life.Now we are in dire need of a new profession,namely energy manager.We not only need to have passion and responsibility,but also a scientific approach to conserve energy and cut emissions.APpropriate legislation should be in place.and a special profession should be introduced to ensure the implementation of these laws and regulations."