本系统的开发就是为了给网络使用者提供一个有用的网络数据包分析工具。

The development of the system was to provide the users with a useful tool that analysis the network packets.

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然后在介绍了分层网络数据包的类型及结构的基础上，给出数据包分析处理类的设计。

Then, It introduces the types and structures of packets and presents the design of packet analysis class.

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基于数据链路层的网络计费方式中关键的技术在于链路层数据包的捕获及分析。

The key technology of net-charging based on data-link Layer is the capture and analysis of data frame.

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