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NetworkManager — network management daemon

Synopsis

NetworkManager [OPTIONS...]

Description

The NetworkManager daemon attempts to make networking configuration and operation as painless and automatic as possible by managing the primary network connection and other network interfaces, like Ethernet, WiFi, and Mobile Broadband devices. NetworkManager will connect any network device when a connection for that device becomes available, unless that behavior is disabled. Information about networking is exported via a D-Bus interface to any interested application, providing a rich API with which to inspect and control network settings and operation.

Dispatcher scripts

NetworkManager will execute scripts in the /etc/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 and connectivity-change actions it is always "none".

The actions are:

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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.

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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

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dhcp4-change

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

dhcp6-change

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

connectivity-change

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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

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The name (ID) of the connection profile.

CONNECTION_DBUS_PATH

The NetworkManager D-Bus path of the connection.

CONNECTION_FILENAME

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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.

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

IP4_DOMAINS

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DHCP4_

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_ and DHCP6_

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.)

Options

The following options are understood:

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--version | -V

Print the NetworkManager software version and exit.

--help | -h

Print NetworkManager's available options and exit.

--no-daemon | -n

Do not daemonize.

--debug | -d

Do not daemonize, and direct log output to the controlling terminal in addition to syslog.

--pid-file | Shoes Red Pointy Red 12CM 85mm Pumps Womens 5 14 Slip Dress US Stiletto On Suede S0le Toe Leather T High Heels Chris Party -p

Specify location of a PID file. The PID file is used for storing PID of the running process and prevents running multiple instances.

--state-file

Specify file for storing state of the NetworkManager persistently. If not specified, the default value of /var/lib/NetworkManager/NetworkManager.state is used.

--config

Specify configuration file to set up various settings for NetworkManager. If not specified, the default value of /etc/NetworkManager/NetworkManager.conf is used with a fallback to the older 'nm-system-settings.conf' if located in the same directory. See 40 EU M Agacia Step L'Artiste M Spring Women's Tan by qY0AHw8 for more information on configuration file.

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List plugins used to manage system-wide connection settings. This list has preference over plugins specified in the configuration file. See main.plugins setting in 40 EU M Agacia Step L'Artiste M Spring Women's Tan by qY0AHw8 for supported options.

--log-level

Sets how much information NetworkManager sends to the log destination (usually syslog's "daemon" facility). By default, only informational, warning, and error messages are logged. See the section on logging in 40 EU M Agacia Step L'Artiste M Spring Women's Tan by qY0AHw8 for more information.

--log-domains

A comma-separated list specifying which operations are logged to the log destination (usually syslog). By default, most domains are logging-enabled. See the section on logging in 40 EU M Agacia Step L'Artiste M Spring Women's Tan by qY0AHw8 for more information.

--print-config

Print the NetworkManager configuration to stdout and exit.

Udev Properties

udev(7) device manager is used for the network device discovery. The following property influences how NetworkManager manages the devices:

NM_UNMANAGED

No default connection will be created and automatic activation will not be attempted when this property of a device is set to a true value ("1" or "true"). You will still be able to attach a connection to the device manually or observe externally added configuration such as addresses or routes.

Create an udev rule that sets this property to prevent NetworkManager from interfering with virtual Ethernet device interfaces that are managed by virtualization tools.

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SIGNALS

NetworkManager process handles the following signals:

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The signal causes a reload of NetworkManager's configuration. Note that not all configuration parameters can be changed at runtime and therefore some changes may be applied only after the next restart of the daemon. A SIGHUP also involves further reloading actions, like doing a DNS update and restarting the DNS plugin. The latter can be useful for example when using the dnsmasq plugin and changing its configuration in /etc/NetworkManager/dnsmasq.d. However, it also means this will shortly interrupt name resolution. In the future, there may be further actions added. A SIGHUP means to update NetworkManager configuration and reload everything that is supported. Note that this does not reload connections from disk. For that there is a D-Bus API and nmcli's reload action

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The signal forces a rewrite of DNS configuration. Contrary to SIGHUP, this does not restart the DNS plugin and will not interrupt name resolution. In the future, further actions may be added. A SIGUSR1 means to write out data like resolv.conf, or refresh a cache. It is a subset of what is done for SIGHUP without reloading configuration from disk.

SIGUSR2

The signal has no effect at the moment but is reserved for future use.

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The following environment variables are supported to help debugging. When used in conjunction with the --no-daemon option (thus echoing PPP and DHCP helper output to stdout) these can quickly help pinpoint the source of connection issues. Also see the --log-level and --log-domains to enable debug logging inside NetworkManager itself.

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