Research And Implementation Of High-speed Network Monitoring Filtering Technology

With popularization of Internet application, information resources that shared in network is increasing with surprising speed, network has become an important information carrier in the global range and one of the main channels to propagate information. But it produces some outstanding problems at the same time. First, a large amount of information resources are difficulty to search . Second, the question of the safety of information of the network, such as the destruction of the virus, reactionary , pornography , violence information spread through Internet, etc. all of these have become the serious problems to resolve. Thirdly, the flooding of junkmail. To solve the problems above , the study of network content monitoring and filtering technology has significant effect in promoting Internet application .According to the current requirement, we study the key technology of network content monitoring and filtering and realize a distributed network content monitoring and filtering system. This system can monitor the network operations and data of all users on the networks of the intra-area, without influencing the major network business to launch.According provincial and national level main-body network, This system has adopted many processor parallel computation system structure to parser magnanimity network datum real time. It has reduced the complexity of system realization and improves the performance of system by Distributing the data flow of the network to every processor evenly through business distribution and bear balance.According network data gathering and protocol analyzing, because of the variety kind of the protocol, we have absorbed the advantage with good expansibility of the middle component technology of software ,the module of data gathering module and Protocol analyzing is designed as independent component. Through disposing different module in this system ,it can deal with various kinds of application data (HTTP, FTP, TELNET.SMTP, etc) in TCP/IP networks, at the same time it can deal with the data of the short message business too.While the network data are enormous in quantity, this paper has proposed an text filtering model with high performance. It can match the keyword in the magnanimity data rapidly by the multimode character matching technology in the theory of finite automaton, base on the idea of Aho-Corasick Arithmetic.