Many of Linux distributions already shipped with tcpdump tool, if in case you don’t have it on systems, you can install it using following Yum command. It saves the file in a pcap format, that can be viewed by tcpdump command or a open source GUI based tool called Wireshark (Network Protocol Analyzier) that reads tcpdump pcap format files. tcpdump also gives us a option to save captured packets in a file for future analysis. It is available under most of the Linux/Unix based operating systems. Tcpdump is a most powerful and widely used command-line packets sniffer or package analyzer tool which is used to capture or filter TCP/IP packets that received or transferred over a network on a specific interface. A user with the necessary privileges on a system acting as a router or gateway through which unencrypted traffic such as Telnet or HTTP passes can use tcpdump to view login IDs, passwords, the URLs and content of websites being viewed, or any other unencrypted information. It is also possible to use tcpdump for the specific purpose of intercepting and displaying the communications of another user or computer. Tcpdump can write packets to standard output or a file. It can read packets from a network interface card or from a previously created saved packet file. ![]() Tcpdump prints the contents of network packets. ![]() ![]() It allows the user to intercept and display TCP/IP and other packets being transmitted or received over a network to which the computer is attached. Tcpdump is a common packet analyzer that runs under the command line.
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