| With the development of computer technology and Internet, networkoffice, management application in enterprise management is more andmore widely, play a role that can not be ignored. But variousTrojan viruses and other network monitor has been threatening thesafety of computer network. Network security has become animportant factor affecting the development of enterprises. Enterprisedevelop a suitable lan security real-time monitor system is particularlyimportant at the background. The system uses VC6.0to carry on andapply MFC to design, using widely used, open, Windows Sockets. Inthis paper, according to the study of network monitoring system basedon LAN, monitor analysis and capture of data packet. It can knowwhich IP address to access the LAN, through experience or common IPaddress table, analyzed which are theaters. It can grasp of the networkperformance, quality and safety with operating LAN equipment andnetwork lines. The system uses Winsock2raw socket technology, so thatthe system has good maintainability and reusability. Using threadtechnology, unlimited packet capture, data acquisition and analysis ofsynchronous, ensure not missing data packet. By using the MFCmessage mechanism, monitor timely access to user, enhances thesystem response to users timely, prevent hackers listening on port.Thesis is divided into7parts：introduction, Relevant technical description，requirements analysis, system outline design, detailed system design,system implementation and system testing. |
