1NETWORKMANAGER(8) Network management daemons NETWORKMANAGER(8)
2
6 NetworkManager - network management daemon
7
9 NetworkManager [OPTIONS...]
10
12 The NetworkManager daemon attempts to make networking configuration and
13 operation as painless and automatic as possible by managing the primary
14 network connection and other network interfaces, like Ethernet, WiFi,
15 and Mobile Broadband devices. NetworkManager will connect any network
16 device when a connection for that device becomes available, unless that
17 behavior is disabled. Information about networking is exported via a
18 D-Bus interface to any interested application, providing a rich API
19 with which to inspect and control network settings and operation.
20
22 NetworkManager will execute scripts in the
23 /etc/NetworkManager/dispatcher.d directory or subdirectories in
24 alphabetical order in response to network events. Each script should be
25 a regular executable file owned by root. Furthermore, it must not be
26 writable by group or other, and not setuid.
27 Each script receives two arguments, the first being the interface name
29 of the device an operation just happened on, and second the action. For
30 device actions, the interface is the name of the kernel interface
31 suitable for IP configuration. Thus it is either VPN_IP_IFACE,
32 DEVICE_IP_IFACE, or DEVICE_IFACE, as applicable. For the hostname and
33 connectivity-change actions it is always "none".
34 The actions are:
36 pre-up
38 The interface is connected to the network but is not yet fully
39 activated. Scripts acting on this event must be placed or symlinked
40 into the /etc/NetworkManager/dispatcher.d/pre-up.d directory, and
41 NetworkManager will wait for script execution to complete before
42 indicating to applications that the interface is fully activated.
43 up
45 The interface has been activated.
46 pre-down
48 The interface will be deactivated but has not yet been disconnected
49 from the network. Scripts acting on this event must be placed or
50 symlinked into the /etc/NetworkManager/dispatcher.d/pre-down.d
51 directory, and NetworkManager will wait for script execution to
52 complete before disconnecting the interface from its network. Note
53 that this event is not emitted for forced disconnections, like when
54 carrier is lost or a wireless signal fades. It is only emitted when
55 there is an opportunity to cleanly handle a network disconnection
56 event.
57 down
59 The interface has been deactivated.
60 vpn-pre-up
62 The VPN is connected to the network but is not yet fully activated.
63 Scripts acting on this event must be placed or symlinked into the
64 /etc/NetworkManager/dispatcher.d/pre-up.d directory, and
65 NetworkManager will wait for script execution to complete before
66 indicating to applications that the VPN is fully activated.
67 vpn-up
69 A VPN connection has been activated.
70 vpn-pre-down
72 The VPN will be deactivated but has not yet been disconnected from
73 the network. Scripts acting on this event must be placed or
74 symlinked into the /etc/NetworkManager/dispatcher.d/pre-down.d
75 directory, and NetworkManager will wait for script execution to
76 complete before disconnecting the VPN from its network. Note that
77 this event is not emitted for forced disconnections, like when the
78 VPN terminates unexpectedly or general connectivity is lost. It is
79 only emitted when there is an opportunity to cleanly handle a VPN
80 disconnection event.
81 vpn-down
83 A VPN connection has been deactivated.
84 hostname
86 The system hostname has been updated. Use gethostname(2) to
87 retrieve it. The interface name (first argument) is empty and no
88 environment variable is set for this action.
89 dhcp4-change
91 The DHCPv4 lease has changed (renewed, rebound, etc).
92 dhcp6-change
94 The DHCPv6 lease has changed (renewed, rebound, etc).
95 connectivity-change
97 The network connectivity state has changed (no connectivity, went
98 online, etc).
99 The environment contains more information about the interface and the
101 connection. The following variables are available for the use in the
102 dispatcher scripts:
103 NM_DISPATCHER_ACTION
105 The dispatcher action like "up" or "dhcp4-change", identical to the
106 first command line argument. Since NetworkManager 1.12.0.
107 CONNECTION_UUID
109 The UUID of the connection profile.
110 CONNECTION_ID
112 The name (ID) of the connection profile.
113 CONNECTION_DBUS_PATH
115 The NetworkManager D-Bus path of the connection.
116 CONNECTION_FILENAME
118 The backing file name of the connection profile (if any).
119 CONNECTION_EXTERNAL
121 If "1", this indicates that the connection describes a network
122 configuration created outside of NetworkManager.
123 DEVICE_IFACE
125 The interface name of the control interface of the device.
126 Depending on the device type, this differs from DEVICE_IP_IFACE.
127 For example for ADSL devices, this could be 'atm0' or for WWAN
128 devices it might be 'ttyUSB0'.
129 DEVICE_IP_IFACE
131 The IP interface name of the device. This is the network interface
132 on which IP addresses and routes will be configured.
133 IP4_ADDRESS_N
135 The IPv4 address in the format "address/prefix gateway", where N is
136 a number from 0 to (# IPv4 addresses - 1). gateway item in this
137 variable is deprecated, use IP4_GATEWAY instead.
138 IP4_NUM_ADDRESSES
140 The variable contains the number of IPv4 addresses the script may
141 expect.
142 IP4_GATEWAY
144 The gateway IPv4 address in traditional numbers-and-dots notation.
145 IP4_ROUTE_N
147 The IPv4 route in the format "address/prefix next-hop metric",
148 where N is a number from 0 to (# IPv4 routes - 1).
149 IP4_NUM_ROUTES
151 The variable contains the number of IPv4 routes the script may
152 expect.
153 IP4_NAMESERVERS
155 The variable contains a space-separated list of the DNS servers.
156 IP4_DOMAINS
158 The variable contains a space-separated list of the search domains.
159 DHCP4_<dhcp-option-name>
161 If the connection used DHCP for address configuration, the received
162 DHCP configuration is passed in the environment using standard DHCP
163 option names, prefixed with "DHCP4_", like
164 "DHCP4_HOST_NAME=foobar".
165 IP6_<name> and DHCP6_<name>
167 The same variables as for IPv4 are available for IPv6, but the
168 prefixes are IP6_ and DHCP6_ instead.
169 CONNECTIVITY_STATE
171 The network connectivity state, which can take the values defined
172 by the NMConnectivityState type, from the
173 org.freedesktop.NetworkManager D-Bus API: unknown, none, portal,
174 limited or full. Note: this variable will only be set for
175 connectivity-change actions.
176 In case of VPN, VPN_IP_IFACE is set, and IP4_*, IP6_* variables with
178 VPN prefix are exported too, like VPN_IP4_ADDRESS_0,
179 VPN_IP4_NUM_ADDRESSES.
180 Dispatcher scripts are run one at a time, but asynchronously from the
182 main NetworkManager process, and will be killed if they run for too
183 long. If your script might take arbitrarily long to complete, you
184 should spawn a child process and have the parent return immediately.
185 Scripts that are symbolic links pointing inside the
186 /etc/NetworkManager/dispatcher.d/no-wait.d/ directory are run
187 immediately, without waiting for the termination of previous scripts,
188 and in parallel. Also beware that once a script is queued, it will
189 always be run, even if a later event renders it obsolete. (Eg, if an
190 interface goes up, and then back down again quickly, it is possible
191 that one or more "up" scripts will be run after the interface has gone
192 down.)
193
195 The following options are understood:
196 --version | -V
198 Print the NetworkManager software version and exit.
199 --help | -h
201 Print NetworkManager's available options and exit.
202 --no-daemon | -n
204 Do not daemonize.
205 --debug | -d
207 Do not daemonize, and direct log output to the controlling terminal
208 in addition to syslog.
209 --pid-file | -p
211 Specify location of a PID file. The PID file is used for storing
212 PID of the running process and prevents running multiple instances.
213 --state-file
215 Specify file for storing state of the NetworkManager persistently.
216 If not specified, the default value of
217 /var/lib/NetworkManager/NetworkManager.state is used.
218 --config
220 Specify configuration file to set up various settings for
221 NetworkManager. If not specified, the default value of
222 /etc/NetworkManager/NetworkManager.conf is used with a fallback to
223 the older 'nm-system-settings.conf' if located in the same
224 directory. See NetworkManager.conf(5) for more information on
225 configuration file.
226 --plugins
228 List plugins used to manage system-wide connection settings. This
229 list has preference over plugins specified in the configuration
230 file. See main.plugins setting in NetworkManager.conf(5) for
231 supported options.
232 --log-level
234 Sets how much information NetworkManager sends to the log
235 destination (usually syslog's "daemon" facility). By default, only
236 informational, warning, and error messages are logged. See the
237 section on logging in NetworkManager.conf(5) for more information.
238 --log-domains
240 A comma-separated list specifying which operations are logged to
241 the log destination (usually syslog). By default, most domains are
242 logging-enabled. See the section on logging in
243 NetworkManager.conf(5) for more information.
244 --print-config
246 Print the NetworkManager configuration to stdout and exit.
247
249 udev(7) device manager is used for the network device discovery. The
250 following property influences how NetworkManager manages the devices:
251 NM_UNMANAGED
253 No default connection will be created and automatic activation will
254 not be attempted when this property of a device is set to a true
255 value ("1" or "true"). You will still be able to attach a
256 connection to the device manually or observe externally added
257 configuration such as addresses or routes.
258 Create an udev rule that sets this property to prevent
260 NetworkManager from interfering with virtual Ethernet device
261 interfaces that are managed by virtualization tools.
262
264 NetworkManager process handles the following signals:
265 SIGHUP
267 The signal causes a reload of NetworkManager's configuration. Note
268 that not all configuration parameters can be changed at runtime and
269 therefore some changes may be applied only after the next restart
270 of the daemon. A SIGHUP also involves further reloading actions,
271 like doing a DNS update and restarting the DNS plugin. The latter
272 can be useful for example when using the dnsmasq plugin and
273 changing its configuration in /etc/NetworkManager/dnsmasq.d.
274 However, it also means this will shortly interrupt name resolution.
275 In the future, there may be further actions added. A SIGHUP means
276 to update NetworkManager configuration and reload everything that
277 is supported. Note that this does not reload connections from disk.
278 For that there is a D-Bus API and nmcli's reload action
279 SIGUSR1
281 The signal forces a rewrite of DNS configuration. Contrary to
282 SIGHUP, this does not restart the DNS plugin and will not interrupt
283 name resolution. In the future, further actions may be added. A
284 SIGUSR1 means to write out data like resolv.conf, or refresh a
285 cache. It is a subset of what is done for SIGHUP without reloading
286 configuration from disk.
287 SIGUSR2
289 The signal has no effect at the moment but is reserved for future
290 use.
291 An alternative to a signal to reload configuration is the Reload D-Bus
293 call. It allows for more fine-grained selection of what to reload, it
294 only returns after the reload is complete, and it is guarded by
295 PolicyKit.
296
298 The following environment variables are supported to help debugging.
299 When used in conjunction with the --no-daemon option (thus echoing PPP
300 and DHCP helper output to stdout) these can quickly help pinpoint the
301 source of connection issues. Also see the --log-level and --log-domains
302 to enable debug logging inside NetworkManager itself.
303 NM_PPP_DEBUG: When set to anything, causes NetworkManager to turn on
305 PPP debugging in pppd, which logs all PPP and PPTP frames and
306 client/server exchanges.
307
309 Please report any bugs you find in NetworkManager at the NetworkManager
310 bug tracker[1].
311
313 NetworkManager home page[2], NetworkManager.conf(5), nmcli(1), nmcli-
314 examples(7), nm-online(1), nm-settings(5), nm-applet(1), nm-connection-
315 editor(1), udev(7)
316
318 1. NetworkManager bug tracker
319 https://bugzilla.gnome.org/enter_bug.cgi?product=NetworkManager
320 2. NetworkManager home page
322 https://wiki.gnome.org/Projects/NetworkManager
323NetworkManager 1.14.0 NETWORKMANAGER(8)