What are useful command-line network monitors on Linux

While there are many dedicated network monitoring systems capable of 24/7/365 monitoring, you can also leverage command-line network monitors in certain situations, where a dedicated monitor is an overkill. Packet-Level Sniffing In this category, monitoring tools capture individual packets on the wire, dissect their content, and display decoded packet content or packet-level statistics. 10. tcpdump An command-line packet sniffer which is capable of capturing nework packets on the wire based on filter expressions, dissect a wide range of protocols associated with the packets, and dump the packet content for packet-level analysis. 15. netstat A command-line tool that shows various statistics and properties of the networking stack, such as open TCP/UDP connections, network interface RX/TX statistics, routing tables, protocol/socket statistics. It relies on a number of TCP/UDP based scanning techniques to detect open ports, live hosts, or existing operating systems on the local network.

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