Passive fingerprinting with p0f
P0f is a passive fingerprinting tool that offers interesting possibilities for gathering information about other systems, without generating any traffic at all (unlike active port scanners ala Nmap).
The concept of passive fingerprinting was not novel at the time that the development of p0f started, but p0f certainly pushed it to the edge, taking into consideration many more aspects of the packet than its precursors.
By Flavio Villanustre at Flavio's TechnoTalk.
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- Software: P0f