The following tcpdump syntax prints the packet in ASCII. Using -c option you can specify the number of packets to capture. When you execute tcpdump command it gives packets until you cancel the tcpdump command. Tcpdump: verbose output suppressed, use -v or -vv for full protocol decode i option with tcpdump command, allows you to filter on a particular ethernet interface. When you execute tcpdump command without any option, it will capture all the packets flowing through all the interfaces. Once tcpdump tool is installed on systems, you can continue to browse following commands with their examples. Install tcpdump on Fedora, CentOS and RHEL linux following command: # yum install tcpdump Install tcpdump on Debian, Ubuntu, Mint linux using command: # sudo apt-get install tcpdump -y The port of tcpdump for Windows is called WinDump it uses WinPcap, the Windows port of libpcap. In those systems, tcpdump uses the libpcap library to capture packets. Tcpdump works on most Unix-like operating systems: Linux, Solaris, BSD, Mac OS X, HP-UX and AIX among others. Distributed under the BSD license, tcpdump is free software. 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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