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tcpdump

Dump traffic on a network.

  • List available network interfaces:

tcpdump -D

  • Capture the traffic of a specific interface:

tcpdump -i {{eth0}}

  • Capture all TCP traffic showing contents (ASCII) in console:

tcpdump -A tcp

  • Capture the traffic from or to a host:

tcpdump host {{www.example.com}}

  • Capture the traffic from a specific interface, source, destination and destination port:

tcpdump -i {{eth0}} src {{192.168.1.1}} and dst {{192.168.1.2}} and dst port {{80}}

  • Capture the traffic of a network:

tcpdump net {{192.168.1.0/24}}

  • Capture all traffic except traffic over port 22 and save to a dump file:

tcpdump -w {{dumpfile.pcap}} not port {{22}}

  • Read from a given dump file:

tcpdump -r {{dumpfile.pcap}}