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tcpdump

Dump traffic on a network.

More information.

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} port not {22}

Read from a given dump file:

tcpdump -r {dumpfile.pcap}

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