A network’s traffic is essentially a flow of packets. Packet captures, and packet processing is used to analyze traffic. Log analysis, traffic analysis, and packet capture analysis are most important for network security. Tcpdump uses a command-line interface to provide packet content definitions in a variety of formats based on the command used. Tcpdump is a free, open-source network utility licensed under the BSD license. It is a packet analyzer that tracks and records TCP/IP traffic between a network and the machine on which it is run. Tcpdump is also one of the most used network analysis tools as it provides simplicity and efficiency in one interface.
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