Checking the Status of Network Links with
You can inspect information about network connections by using the
networkctl command. This can help you configure networking services and troubleshoot networking problems.
You can progressively add options and arguments to the
networkctl command to move from general information about network connections to specific information about a network connection.
networkctl Command Without Options
networkctl command without options to default to the list command:
networkctl IDX LINK TYPE OPERATIONAL SETUP 1 lo loopback carrier unmanaged 2 eth0 ether routable configured 3 docker0 ether routable unmanaged 11 vethb0aa7a6 ether degraded unmanaged 4 links listed.
networkctl status Command
networkctl with the status command to display the following information:
root@photon-rc [ ~ ]# networkctl status * State: routable Address: 198.51.100.131 on eth0 172.17.0.1 on docker0 fe80::20c:29ff:fe55:3ca6 on eth0 fe80::42:f0ff:fef7:bd81 on docker0 fe80::4c84:caff:fe76:a23f on vethb0aa7a6 Gateway: 198.51.100.2 on eth0 DNS: 198.51.100.2
You can see that there are active network links with IP addresses for not only the Ethernet connection but also a Docker container.
networkctl status Command With Network Link Option
You can add a network link, such as the Ethernet connection, as the argument of the
status command to show specific information about the link:
root@photon-rc [ ~ ]# networkctl status eth0 * 2: eth0 Link File: /usr/lib/systemd/network/99-default.link Network File: /etc/systemd/network/99-dhcp-en.network Type: ether State: routable (configured) Path: pci-0000:02:01.0 Driver: e1000 HW Address: 00:0c:29:55:3c:a6 (VMware, Inc.) MTU: 1500 Address: 198.51.100.131 fe80::20c:29ff:fe55:3ca6 Gateway: 198.51.100.2 DNS: 198.51.100.2 CLIENTID: ffb6220feb00020000ab116724f520a0a77337
networkctl status Command With Docker Option
You can add a Docker container as the argument of the
status command to show specific information about the container:
networkctl status docker0 * 3: docker0 Link File: /usr/lib/systemd/network/99-default.link Network File: n/a Type: ether State: routable (unmanaged) Driver: bridge HW Address: 02:42:f0:f7:bd:81 MTU: 1500 Address: 172.17.0.1 fe80::42:f0ff:fef7:bd81
In the example above, the state of the Docker container is unmanaged because Docker handles managing the networking for the containers without using systemd-resolved or systemd-networkd. Docker manages the container connection by using its bridge drive.
For more information about
networkctl commands and options, see https://www.freedesktop.org/software/systemd/man/networkctl.html.