Provided by: xtables-addons-common_3.23-1_amd64 bug

NAME
       pknlusr — userspace monitor for successful xt_pknock matches


Synopsis
       pknlusr [group-id]


Description
       xt_pknock is an xtables match extension that implements so-called port knocking. It can be
       configured to send information about  each  successful  match  via  a  netlink  socket  to
       userspace. pknluser listens for these notifications.

       By  default, pknlusr listens for messages sent to netlink multicast group 1. Another group
       ID may be passed as a command-line argument.


See also
       xtables-addons(8)