When debugging TCP networking in Linux, guessing is not enough. You need packet-level visibility. tcpdump is one of the most useful tools for monitoring Internet traffic on a live network. It provides a real-time textual view of packets, letting you inspect TCP handshakes, retransmissions, resets, and traffic flows between IPs and ports. Whether you’re troubleshooting a connection failure or validating network behavior, tcpdump helps you see what’s actually happening on the wire. #linux #softwar