1NFNL_OSF(8)                     iptables 1.8.9                     NFNL_OSF(8)
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NAME

6       nfnl_osf - OS fingerprint loader utility
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SYNOPSIS

9       nfnl_osf -f fingerprints [ -d ]
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DESCRIPTION

13       The nfnl_osf utility allows to load a set of operating system signa‐
14       tures into the kernel for later matching against using iptables' osf
15       match.
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OPTIONS

19       -f fingerprints
20              Read signatures from file fingerprints.
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23       -d     Instead of adding the signatures from fingerprints into the ker‐
24              nel, remove them.
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EXIT STATUS

28       Exit status is 0 if command succeeded, otherwise a negative return code
29       indicates the type of error which happened:
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32       -1     Illegal arguments passed, fingerprints file not readable or
33              failure in netlink communication.
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36       -ENOENT
37              Fingerprints file not specified.
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40       -EINVAL
41              Netlink handle initialization failed or fingerprints file format
42              invalid.
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FILES

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

51       The description of osf match in iptables-extensions(8) contains further
52       information about the topic as well as example nfnl_osf invocations.
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56iptables 1.8.9                                                     NFNL_OSF(8)