复杂环境下网络嗅探技术的应用及防范措施

网络嗅探技术是一种主要的网络攻击方法，它能轻易获得各种网络应用的用户帐号和口令，但本质上它只能用在局域网中。详细分析了共享局域网和交换局域网的网络嗅探原理，并给出了相应的防范措施。提出了一个能够在各种局域网环境下进行网络嗅探的方案，而且指出网络嗅探技术和其他网络攻击技术相结合，能使互联网上的攻击者间接嗅探到局域网内的数据包。

APPLICATIONS AND PROTECTION MEASURES OF NETWORK SNIFFER TECHNOLOGY IN A COMPLICATED ENVIRONMENT

Network sniffer technology is a principal network attack method and it can obtain user account and password of various network applications easily. But it can be only used in the local network. This article first analyses network sniffering principles of shared and exchanging local network and puts many corresponding protection measures. Finally we put forword a scheme that network sniffer can be carried out in various local network environments,and we aslo point out that network attackers in the Internet can sniffer data packets in the local network if they combine network sniffer technology and other network attack technologies.