This section shows how to use the nmcli command line tool to examine the status of NetworkManager’s connections and devices.
Show the status of devices known to NetworkManager:
$ nmcli d
nmcli d
DEVICE TYPE STATE CONNECTION
enp0s31f6 ethernet connected Wired connection 1
docker0 bridge connected docker0
lo loopback unmanaged --
Add --help for more details on a given option.
To show the current status of each of NetworkManager’s connections:
$ nmcli c
NAME UUID TYPE DEVICE
Wired connection 1 59b3aab1-f9a8-3bee-8fd2-2497a1dcd99c ethernet enp0s31f6
docker0 b13e1f13-c23c-47c3-9b3e-ca43ecd79e79 bridge docker0
Finally, we can see the state of radio interfaces, including WiFi and WWAN (cellular) with the radio argument:
$ nmcli r
WIFI-HW WIFI WWAN-HW WWAN
enabled enabled enabled enabled
It is important to make sure that WiFi/WWAN radios are enabled so the respective connection types can establish a connection (we will specify how to this in following sections). As with the other commands, “–help” shows usage information.
Observe NetworkManage activity (changes in connectivity state, devices or connection properties):
$ nmcli monitor
See nmcli connection monitor and nmcli device monitor to watch for changes in certain connections or devices.