In either case tcpdump is also likely to consume a great deal of CPU and memory resources. If writing this output to stdout you will probably be unable to enter commands in your terminal, if writing to a file you may exhaust the host’s disk space. Tcpdump output can be considerable if the network traffic your expression defines is high bandwidth particularly if you are capturing more than the default 68 Bytes of packet content.Ĭapturing packets, for example, related to a large file transfer or a web server being actively used by hundreds or thousands of clients will produce an overwhelming amount of output.
I’ll cover the Basics here and move on to Parameters, then filter Expressions and finally Interpreting Output. This tcpdump Masterclass article series aimes to provide in-depth technical information on the installation, usage and operation of the classic and supremely popular tcpdump network traffic analysis program including alternatives, running tcpdump as a process, building expressions, understanding output and more.
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