针对监视器应实时、高效的原则，详细讨论了基于Unix系统的Internet网络监视器的设计方案与实现方法.由此将整个系统分为3层：在底层部分，简述了DLPI接口、STREAM机制，详细讨论了线程之间的同步与互斥问题；在中层部分，为提高系统的性能，提出了分布式处理的方案，并对该方案实现中的几个关键问题进行了讨论，同时为了说明实际效果，给出了部分实际运行数据；在上层部分，采用了CGI程序的编程技术和基于WEB用户界面技术，另外，在客户端加入了身份认证机制，以增强系统的安全性.系统相对于国内外同类系统而言，具有在数据处理能力和可扩充性方面的明显优势.%Presented in this paper is the comprehensive and detailedinformation about the design and implementation of Internet Monitor System based on Unix. The main idea is to divide the system into three layers and to set up the databases between layers as the interface: in the first layer, DLPI and STREAM mechanism are introduced, and the synchronism and mutual exclusion between threads are discussed in detail; the middle layer focuses on how to improve the system performance by distributed processing, and provides some experimental data to indicate the advantage of distributed retrieval; in the up layer, the techniques of CGI programming and implementation of the Web-based user interface are employed and the authentication method of browser user is described in detail. Compared with products of domestic and overseas, this system has the advantage of capabilities of data-processing and scalability.
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