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tshark

Packet analysis tool, CLI version of Wireshark.

  • Monitor everything on localhost:

tshark

  • Only capture packets matching a specific capture filter:

tshark -f '{{udp port 53}}'

  • Only show packets matching a specific output filter:

tshark -Y '{{http.request.method == "GET"}}'

  • Decode a TCP port using a specific protocol (e.g. HTTP):

tshark -d tcp.port=={{8888}},{{http}}

  • Specify the format of captured output:

tshark -T {{json|text|ps|…}}

  • Select specific fields to output:

tshark -T {{fields|ek|json|pdml}} -e {{http.request.method}} -e {{ip.src}}

  • Write captured packet to a file:

tshark -w {{path/to/file}}

  • Analyze packets from a file:

tshark -r {{filename}}.pcap