Provided by: iptables_1.8.3-2ubuntu5_amd64 bug

NAME

       nfnl_osf - OS fingerprint loader utility

SYNOPSIS

       nfnl_osf -f fingerprints [ -d ]

DESCRIPTION

       The nfnl_osf utility allows 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.