The act of collecting frames or packets off of a data network communication. This activity allows the evaluation of the header contents as well as the payload of network communications. Packet sniffing requires that the network interface card be placed into promiscuous mode in order to disable the MAC (Media Access Control) address filter which would otherwise discard any network communications not intended for the specific local network interface. (Also known as sniffing or eavesdropping.)
A packet analyzer, also known as packet sniffer, protocol analyzer, or network analyzer, is a computer program or computer hardware such as a packet capture appliance, that can intercept and log traffic that passes over a computer network or part of a network. Packet capture is the process of intercepting and logging traffic. As data streams flow across the network, the analyzer captures each packet and, if needed, decodes the packet's raw data, showing the values of various fields in the packet, and analyzes its content according to the appropriate RFC or other specifications.
A packet analyzer used for intercepting traffic on wireless networks is known as a wireless analyzer or WiFi analyzer. While a packet analyzer can also be referred to as a network analyzer or protocol analyzer these terms can also have other meanings. Protocol analyzer can technically be a broader, more general class that includes packet analyzers/sniffers. However, the terms are frequently used interchangeably.
