If you are looking to capture full TCP handshake, make sure you use "host" vs "src host" or "dst host" to see both request and response flow. Note 2: When you specify a source (src) or destination (dst) flags, tcpdump will only filter in that direction. This guide will show you how to isolate traffic in multiple waysincluding by IP, port, protocol, or application to help you find what you’re looking for. Separate your entries with a comma, space, or semicolon. tcpdump is the world’s premier network analysis toolcombining both power and simplicity into a single command-line interface.
This utility is not encompassing of all options tcpdump offers a complete list of options can be found via its manual: Note: Host, Source Host, and Destination Host can take multiple entries. This utility is to help generate a tcpdump command using some of the more common switches / filters offered by the tcpdump. tcpdump is very versatile with many switches to granularly capture what you need to dubug network traffic with options to output results via console, file, or wireshark pcap. In short, it's the wireshark of linux to gathering packet captures. Tcpdump is a utility commonly installed / available to many Linux distributions to quickly gather a network trace / packet capture.
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