p0f

Passive OS fingerprinting and masquerade detection tool

brewmacoslinux

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Versatile passive OS fingerprinting, masquerade detection tool

p0f

Capture and analyze packets on default interface$ p0f -i eth0

Read packets from pcap file and fingerprint OS$ p0f -r captured.pcap

Monitor traffic with verbose output and write to log$ p0f -i eth0 -w p0f.log -v