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netplug - network link monitor daemon…  more info»


NETPLUGD(8)          BSD System Manager's Manual         NETPLUGD(8)

     netplugd — network cable hotplug management daemon

     netplugd [-FP] [-c config_file] [-i interface_pattern]
              [-p pid_file]

     netplugd is a daemon that responds to network link events from
     the Linux kernel, such as a network interface losing or acquir‐
     ing a carrier signal.

     When an Ethernet-style network interface on a host is plugged
     into a powered-up switch, hub, or other host, the two use a
     carrier signal to establish that the link is alive.  The Linux
     kernel makes this information available through its netlink(7)

     The netplugd daemon listens for carrier detection and loss mes‐
     sages from the kernel's netlink(7) subsystem.  When a carrier
     signal is detected on an interface, it runs a script to bring
     the interface up.  When carrier is lost, netplugd runs a script
     to bring the interface down.  netplugd does not define any
     policies for how to manage interfaces; it leaves that to a
     script, /etc/netplug.d/netplug, which is described in FILES

     You tell netplugd which interfaces it should manage by giving
     it a list of shell-style glob patterns, which it matches
     against using the fnmatch(3) function.  For example, a pattern
     of eth[13] will tell netplugd to only manage eth1 and eth3, if
     those interfaces exist.  If the interfaces are not known to the
     kernel at the time you start netplugd, perhaps because they are
     unplugged PCMCIA network interfaces or devices whose drivers
     have not yet been installed, netplugd will start to manage them
     as soon as they are plugged in or their drivers are available.

     -F      Run in the foreground; do not detach and run as a dae‐
             mon.  Messages are logged to stdout or stderr, instead
             of using the syslog(3) mechanism.  This option is use‐
             ful mainly for debugging your configuration.

     -P      Prevent autoprobing for interfaces.  The netplugd dae‐
             mon normally probes for all possible interface names
             that might match the patterns you tell it to manage.
             This is necessary in order to get network driver mod‐
             ules (the default with almost all Linux distributions)
             loaded and set up, so that they can provide link status
             notifications to the netplugd daemon.  Autoprobing
             should always be safe, and doesn't take long.  Disable
             it with caution.

     -c config_file
             Specify the name of a file from which to read patterns
             that describe the interfaces to manage.  You can pro‐
             vide this option multiple times to read from more than
             one file.  If you do not provide this option at all,
             netplugd will attempt to read from a default config
             file.  If you do not want netplugd to try to read from
             any real config files, you can specify /dev/null as a
             config file.

     -i interface_pattern
             Specify a pattern that will be used to match interface
             names that netplugd should manage.  You can provide
             this option multiple times to specify multiple pat‐

     -p pid_file
             Write the daemon's process ID to the file pid_file.  If
             you tell netplugd to run in the foreground, this option
             is ignored.

             Default config file to read, if none is specified on
             the command line.  The config file format is one pat‐
             tern per line, with white space, empty lines, and com‐
             ments starting with a # character ignored.  Patterns
             are standard shell-style glob patterns, e.g.

             The "policy" program (typically a shell script) that
             netplugd uses to probe for interfaces, and to bring
             them up or down in response to network link events.
             This program is called with the name of the interface
             as its first argument, and one of the following

             in      A cable was plugged in, or carrier came up.
                     The command should bring the interface up.  The
                     command is run asynchronously, and it should
                     exit with status 0 on success.

             out     A cable was plugged out, or carrier went down.
                     The command should bring the interface down.
                     The command is run asynchronously, and it
                     should exit with status 0 on success.

             probe   The command should load and initialise the
                     driver for this interface, if possible, and
                     bring the interface into the "up" state, so
                     that it can generate netlink(7) events.  The
                     command is run synchronously; it must exit with
                     status code 0 if it succeeds, otherwise with a
                     non-zero exit code or signal.

             The init(8) script that starts, stops, and displays
             status of the netplugd daemon.

     netplugd was written by Bryan O'Sullivan <>.

     Copyright 2003 PathScale, Inc.  Copyright 2003, 2004, 2005
     Bryan O'Sullivan

     netplugd is free software; you can redistribute it and/or mod‐
     ify it under the terms of the GNU General Public License, ver‐
     sion 2, as published by the Free Software Foundation.  You are
     forbidden from redistributing or modifying it under the terms
     of any other license, including other versions of the GNU Gen‐
     eral Public License.

     netplugd is distributed in the hope that it will be useful, but
     WITHOUT ANY WARRANTY; without even the implied warranty of MER‐
     General Public License for more details.

     cardmgr(5), hotplug(8), ip(8), netlink(7)

Linux 2.6                  August 26, 2003                 Linux 2.6
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