sniffer--part4
Sniffer，中文可以翻译为嗅探器，是一种基于被动侦听原理的网络分析方法。使用这种技术方法，可以监视网络的状态、数据流动状况以及网络上传输的信息。snifferSniffer分为软件和硬件两种，软件的Sniffer有SnifferPro、NetworkMonitor、PacketBone等，其长处是易于安装部署，易于学习使用，一起也易于交换；缺陷是无法抓取网络上一切的传输，某些状况下也就无法真实理解网络的故障和运行状况。硬件的Sniffer通常称为协议分析仪，通常都是商业性的，报价也对比贵重，但会具备支持各类扩展的链路捕获能力以及高性能的数据实时捕获分析的功能。基于以太网络嗅探的Sniffer只能抓取一个物理网段内的包，就是说，你和监听的目标核心不能有路由或别的屏蔽播送包的设备，这一点很主要。所以，对通常拨号上网的用户来说，是不可能使用Sniffer来窃听到别的人的通信内容的。(Sniffer, which can be translated as sniffer in Chinese, is a network analysis method based on the principle of passive listening. Using this technical approach, it is possible to monitor the state of the network, the flow of data, and the information transmitted over the network. SnifferSniffer is divided into software and hardware. The software Sniffer includes SnifferPro, NetworkMonitor, PacketBone, etc. Its advantages are easy to install and deploy, easy to learn and use, and easy to exchange at the same time; Therefore, it is impossible to truly understand the faults and operating conditions of the network. The hardware Sniffer is usually called a protocol analyzer, which is usually commercial, and the price is relatively expensive, but it will have the function of supporting various extended link capture capabilities and high-performance real-time data capture and analysis. Sniffer based on Ethernet network sniffing can only capture packets within a physical network segment, that is to say, you and the monitored target core cannot have routers or other devices that block broadcast packets. This is very important. Therefore, it is impossible to use Sniffer to eavesdrop on other people's communications for users who usually dial up the Internet.)
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