NFNL_OSF(8)			iptables 1.8.11			   NFNL_OSF(8)



NAME
       nfnl_osf — OS fingerprint loader utility

SYNOPSIS
       nfnl_osf -f fingerprints [ -d ]


DESCRIPTION
       The nfnl_osf utility allows one to load a set of operating system
       signatures into the kernel for later matching against using iptables'
       osf match.


OPTIONS
       -f fingerprints
	      Read signatures from file fingerprints.


       -d     Instead of adding the signatures from fingerprints into the
	      kernel, remove them.


EXIT STATUS
       Exit status is 0 if command succeeded, otherwise a negative return code
       indicates the type of error which happened:


       -1     Illegal arguments passed, fingerprints file not readable or
	      failure in netlink communication.


       -ENOENT
	      Fingerprints file not specified.


       -EINVAL
	      Netlink handle initialization failed or fingerprints file format
	      invalid.


FILES
       An up to date set of operating system signatures can be downloaded from
       http://www.openbsd.org/cgi-bin/cvsweb/src/etc/pf.os .


SEE ALSO
       The description of osf match in iptables-extensions(8) contains further
       information about the topic as well as example nfnl_osf invocations.

iptables 1.8.11							   NFNL_OSF(8)