OpenBSD: PF now with fingerprinting capabilities

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Passive operating system fingerprinting was just committed to PF which exposes the source host's OS to the filter language. Powerful policy enforcement is now possible such as redirecting all older windows boxes to a web site telling them to upgrade. Or blocking all windows boxes from connecting to mail servers (damn worms). In order to contribute to the OS fingerprint database go to http://lcamtuf.coredump.cx/p0f-help/ .

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