Design and Implementation of a System about Network Security and Watch Using WinPcap

Packet capturing technology is the basis for designing analysing software.WinPcap is one of the excellent packet capturing architectures under Windows.This paper analyzes packet capturing principle in detail combined with the structure and functions of the software and introduces its application in designing a network security and watch system. The fundamental principle of this system is to capture all packets of the local network using WinPcap library, and perform protocol analyzing and decoding on these packets,so can monitor the network on real-time and find its problem and alarm automatically.The result from the application in LAN also confirms that the system is steady and very effective.