The Design And Implemet Of Data Analyze Subsystem In LAN Monitor System

With the development of computer science and communication technology, computer network has been the basic settings and can be seen in any where of the society. There are more and more faults in the networks.But it's very difficult to manage the network. A network management tool is very necessary. A good network management system is helpful to know the topology of the network, discover and locate the faluts. It can help the network adminstrator to repair the faluts, which can help to reduce the loss.At the beginning of this paper, the technical background of this paper is introduced, including the function of network management, the composition and the characteristic of SNMP, and the signal and slot mechanism of QT, all of which are the base of this paper.Then the requirement analysis and the architecture design are introduced. In requirement analysis part, the function of the system, the performance of the system and the reliability of the system are illuminated. And in the architecture design part, the design principles, the general framework of the system and the sequence diagram of the system are given.From this information, an overall concept of this project can be known.In chapter four, the design and the implements of state analyse module are introduced.The state analyse module includes topology state data analyzing, physical state data analyzing and the store and search of physical state data.The link-layer topology discovery method based on SNMP protocol is implemented in this chapter.In chapter five, the design and the implements of event analyze module are introduced.The event set is defined and the event analyze method is also introduced.In chapter six, the network packet analyze module is introduced. The network packet analyze module mainly based on the format of network packet defined in TCP/IP protocol.After the analyzing of network packet, the result of the searched network packets is returned. And the route analyzing method of network packet is also given.After the system design and implements, the corresponding unit-test and integration-test are also done.Test-cast tables are used to record the result of the tests.At the end of the paper, a summary of the author's work and what we shoud do in the future are illuminated.