.TH pknlusr 8 "2020-10-22" "xtables-addons" "xtables-addons"
.SH NAME
.PP
pknlusr \(em userspace monitor for successful xt_pknock matches
.SH Synopsis
.PP
\fBpknlusr\fP [\fIgroup-id\fP]
.SH Description
\fIxt_pknock\fP is an xtables match extension that implements so-called \fIport
knocking\fP. It can be configured to send information about each successful
match via a netlink socket to userspace. \fBpknluser\fP listens for these
notifications.
.PP
By default, \fBpknlusr\fP listens for messages sent to netlink multicast group
1. Another group ID may be passed as a command-line argument.
.SH See also
.PP
xtables-addons(8)