Let's learn tcpdump! Read online Get the print version Ever wanted to know how to use tcpdump, but were intimidated by all the command line options? I was too! But then I learned it, and it wasn’t as bad as I thought. In this zine we’ll explain: what kinds of questions you can answer with tcpdump how to interpret tcpdump output which command line arguments are the really important ones how to write a BPF filter to filter tcpdump output There’s a Russian translation.