NAME

       NetworkManager-dispatcher - Dispatch user scripts for NetworkManager

SYNOPSIS

       NetworkManager [OPTIONS...]

DESCRIPTION

       NetworkManager-dispatcher service is a D-Bus activated service that runs user provided
       scripts upon certain changes in NetworkManager.

       NetworkManager-dispatcher will execute scripts in the
       /{etc,usr/lib}/NetworkManager/dispatcher.d directory or subdirectories in alphabetical
       order in response to network events. Each script should be a regular executable file owned
       by root. Furthermore, it must not be writable by group or other, and not setuid.

       Each script receives two arguments, the first being the interface name of the device an
       operation just happened on, and second the action. For device actions, the interface is
       the name of the kernel interface suitable for IP configuration. Thus it is either
       VPN_IP_IFACE, DEVICE_IP_IFACE, or DEVICE_IFACE, as applicable. For the hostname action the
       device name is always "none" and for connectivity-change it is empty.

       The actions are:

       pre-up
           The interface is connected to the network but is not yet fully activated. Scripts
           acting on this event must be placed or symlinked into the
           /etc/NetworkManager/dispatcher.d/pre-up.d directory, and NetworkManager will wait for
           script execution to complete before indicating to applications that the interface is
           fully activated.

       up
           The interface has been activated.

       pre-down
           The interface will be deactivated but has not yet been disconnected from the network.
           Scripts acting on this event must be placed or symlinked into the
           /etc/NetworkManager/dispatcher.d/pre-down.d directory, and NetworkManager will wait
           for script execution to complete before disconnecting the interface from its network.
           Note that this event is not emitted for forced disconnections, like when carrier is
           lost or a wireless signal fades. It is only emitted when there is an opportunity to
           cleanly handle a network disconnection event.

       down
           The interface has been deactivated.

       vpn-pre-up
           The VPN is connected to the network but is not yet fully activated. Scripts acting on
           this event must be placed or symlinked into the
           /etc/NetworkManager/dispatcher.d/pre-up.d directory, and NetworkManager will wait for
           script execution to complete before indicating to applications that the VPN is fully
           activated.

       vpn-up
           A VPN connection has been activated.

       vpn-pre-down
           The VPN will be deactivated but has not yet been disconnected from the network.
           Scripts acting on this event must be placed or symlinked into the
           /etc/NetworkManager/dispatcher.d/pre-down.d directory, and NetworkManager will wait
           for script execution to complete before disconnecting the VPN from its network. Note
           that this event is not emitted for forced disconnections, like when the VPN terminates
           unexpectedly or general connectivity is lost. It is only emitted when there is an
           opportunity to cleanly handle a VPN disconnection event.

       vpn-down
           A VPN connection has been deactivated.

       hostname
           The system hostname has been updated. Use gethostname(2) to retrieve it. The interface
           name (first argument) is empty and no environment variable is set for this action.

       dhcp4-change
           The DHCPv4 lease has changed (renewed, rebound, etc).

       dhcp6-change
           The DHCPv6 lease has changed (renewed, rebound, etc).

       connectivity-change
           The network connectivity state has changed (no connectivity, went online, etc).

       reapply
           The connection was reapplied on the device.

       The environment contains more information about the interface and the connection. The
       following variables are available for the use in the dispatcher scripts:

       NM_DISPATCHER_ACTION
           The dispatcher action like "up" or "dhcp4-change", identical to the first command line
           argument. Since NetworkManager 1.12.0.

       CONNECTION_UUID
           The UUID of the connection profile.

       CONNECTION_ID
           The name (ID) of the connection profile.

       CONNECTION_DBUS_PATH
           The NetworkManager D-Bus path of the connection.

       CONNECTION_FILENAME
           The backing file name of the connection profile (if any).

       CONNECTION_EXTERNAL
           If "1", this indicates that the connection describes a network configuration created
           outside of NetworkManager.

       DEVICE_IFACE
           The interface name of the control interface of the device. Depending on the device
           type, this differs from DEVICE_IP_IFACE. For example for ADSL devices, this could be
           'atm0' or for WWAN devices it might be 'ttyUSB0'.

       DEVICE_IP_IFACE
           The IP interface name of the device. This is the network interface on which IP
           addresses and routes will be configured.

       IP4_ADDRESS_N
           The IPv4 address in the format "address/prefix gateway", where N is a number from 0 to
           (# IPv4 addresses - 1). gateway item in this variable is deprecated, use IP4_GATEWAY
           instead.

       IP4_NUM_ADDRESSES
           The variable contains the number of IPv4 addresses the script may expect.

       IP4_GATEWAY
           The gateway IPv4 address in traditional numbers-and-dots notation.

       IP4_ROUTE_N
           The IPv4 route in the format "address/prefix next-hop metric", where N is a number
           from 0 to (# IPv4 routes - 1).

       IP4_NUM_ROUTES
           The variable contains the number of IPv4 routes the script may expect.

       IP4_NAMESERVERS
           The variable contains a space-separated list of the DNS servers.

       IP4_DOMAINS
           The variable contains a space-separated list of the search domains.

       DHCP4_<dhcp-option-name>
           If the connection used DHCP for address configuration, the received DHCP configuration
           is passed in the environment using standard DHCP option names, prefixed with "DHCP4_",
           like "DHCP4_HOST_NAME=foobar".

       IP6_<name> and DHCP6_<name>
           The same variables as for IPv4 are available for IPv6, but the prefixes are IP6_ and
           DHCP6_ instead.

       CONNECTIVITY_STATE
           The network connectivity state, which can take the values defined by the
           NMConnectivityState type, from the org.freedesktop.NetworkManager D-Bus API: UNKNOWN,
           NONE, PORTAL, LIMITED or FULL. Note: this variable will only be set for
           connectivity-change actions.

       In case of VPN, VPN_IP_IFACE is set, and IP4_*, IP6_* variables with VPN prefix are
       exported too, like VPN_IP4_ADDRESS_0, VPN_IP4_NUM_ADDRESSES.

       Dispatcher scripts are run one at a time, but asynchronously from the main NetworkManager
       process, and will be killed if they run for too long. If your script might take
       arbitrarily long to complete, you should spawn a child process and have the parent return
       immediately. Scripts that are symbolic links pointing inside the
       /etc/NetworkManager/dispatcher.d/no-wait.d/ directory are run immediately, without waiting
       for the termination of previous scripts, and in parallel. Also beware that once a script
       is queued, it will always be run, even if a later event renders it obsolete. (Eg, if an
       interface goes up, and then back down again quickly, it is possible that one or more "up"
       scripts will be run after the interface has gone down.)

BUGS

       Please report any bugs you find in NetworkManager at the NetworkManager issue tracker[1].

SEE ALSO

       NetworkManager home page[2], NetworkManager(8),

NOTES

        1. NetworkManager issue tracker
           https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/issues

        2. NetworkManager home page
           https://networkmanager.dev