Campus Network Flow Monitoring System Research And Implementation

After2000the rapid development of commercial website has greatly boosted the development of the campus network. China’s education scientific research nets<domestic and Internet connected the biggest academic network> success set up and run, education and scientific research in China is to the development of the cause of play an important role. Because the present network communication cost is higher, the impact on the use of the campus network, especially for students’ Internet particularly outstanding. If let students free get to the Internet, expenses shall bear by the school, the school’s burden is too big. The most important is if people are asked to unlimited access Internet would cause the following problems:data transmission speed; Internet users need access without effective safeguard; The resulting cost increase a lot. Today’s campus network, because worms, spam and the original network suddenly paralyzed events slow or sometimes occur. For flow monitoring and flow analysis is an important link of the whole campus network management, through the flow monitoring analysis can help the system administrator in the shortest possible time, found in a threat, which can quickly take measures. How in the core of the network equipment monitoring flow, limit traffic and the abnormal became the key technical problems.This paper first introduced the network traffic detection history and the domestic and foreign research status, network measurement technology and method, then introduces how to link layer packets to capture and analysis, and introduces the realization of this technology WinPcap structure, including WinPcap composition, NPF structure, WinPcap main library function and basic WinPcap packet capture program examples. Based on the current national normal university in southern guizhou campus network facilities as the foundation, to reconstruct flow monitoring for the purpose of campus network, the detailed design and vb script in asp and Java script can achieve the whole campus network may call flow monitoring system of data collection, data analysis, database operation, each functional modules, which explains in detail the data acquisition module and data processing module, mainly including based on WinPcap packet capture and packet analysis method, the related agreement, processes, data structure, and coding realized.