(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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