Inspecting the Status of Network Links with 'networkctl'
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
Run the 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
Run networkctl with the status command to display the following information:
root@photon-rc [ ~ ]# > networkctl status
State: routable
Address: 10.197.103.56 on eno1
172.17.0.1 on docker0
fe80::20c:29ff:fe44:f92c on eno1
Gateway: 10.197.103.253 (Cisco Systems, Inc) on eno1
DNS: 10.142.7.1
10.132.7.1
10.166.17.90
NTP: 10.128.152.81
10.166.1.120
10.188.26.119
10.84.55.42
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 ens33
* 2: ens33
Link File: /usr/lib/systemd/network/99-default.link
Network File: /usr/lib/systemd/network/10-eth.network
Type: ether
State: routable (configured)
Alternative Names: enp2s1
Path: pci-0000:02:01.0
Driver: e1000
Vendor: Intel Corporation
Model: 82545EM Gigabit Ethernet Controller (Copper) (PRO/1000 MT Single Port Adapter)
HW Address: 00:0c:29:5f:d1:39 (VMware, Inc.)
MTU: 1500 (min: 46, max: 16110)
QDisc: fq_codel
IPv6 Address Generation Mode: eui64
Queue Length (Tx/Rx): 1/1
Auto negotiation: yes
Speed: 1Gbps
Duplex: full
Port: tp
Address: 172.16.85.225 (DHCP4 via 172.16.85.254)
fe80::20c:29ff:fe5f:d139
Gateway: 172.16.85.2 (VMware, Inc.)
DNS: 172.16.85.2
DHCP4 Client ID: IAID:0x2b9434c1/DUID
DHCP6 Client DUID: DUID-EN/Vendor:0000ab11d258482fc7eee6510000
Feb 26 10:19:44 photon systemd-networkd[650]: ens33: Link UP
Feb 26 10:19:44 photon systemd-networkd[650]: ens33: Gained carrier
Feb 26 10:19:45 photon systemd-networkd[650]: ens33: DHCPv4 address 172.16.85.225/24 via 172.16.85.2
Feb 26 10:19:46 photon systemd-networkd[650]: ens33: Gained IPv6LL
’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.