passive OS fingerprinting tool
Passive OS fingerprinting technique based on information coming from a
remote host when it establishes a connection to our system. Captured
packets contain enough information to determine the remote OS. Unlike
active scanners like Nmap or QueSO, p0f identifies the remote OS without
sending anything to it.

Maintainer: Rui Reis <rui@openbsd.org>

WWW: http://lcamtuf.coredump.cx/p0f.shtml
