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12 Useful tcpdump commands you can use to troubleshoot network issues

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. It is available under most of the  Linux/Unix  based operating systems. tcpdump also gives us a option to save captured packets in a file for future analysis. 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. How to Install tcpdump in Linux 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. # yum install tcpdump Once  tcpdump  tool is installed on systems, you can continue to browse following commands with their examples. 1. Capture Packets f...