Turning Off DHCP
By default, when Photon OS first starts, it creates a DHCP network configuration file or rule, which appears in /etc/systemd/network, the highest priority directory for network configuration files with the lowest priority filename:
cat /etc/systemd/network/99-dhcp-en.network
[Match]
Name=e*
[Network]
DHCP=yes
To turn off DHCP for all Ethernet interfaces, change the value of DHCP from yes to no, save the changes, and then restart the systemd-networkd service:
systemctl restart systemd-networkd
Or you can reload and reconfigure the settings:
networkctl reload
networkctl reconfigure <interface_name>/<index_number>`
Note:
The advantage of using reload and reconfigure is that the settings of other interfaces are not disturbed and only the settings of the specific interface are reloaded and reconfigured.
If you create a configuration file with a higher priority filename (e.g. 10-static-en.network), it is not necessary but still recommended to turn off DHCP.
You can also check the status of a specific interface:
networkctl status <interface_name>/<index_number>
(eth0 is an example)
❯ networkctl status eth0
● 2: eth0
Link File: /usr/lib/systemd/network/99-default.link
Network File: /etc/systemd/network/50-dhcp-en.network
State: routable (configured)
Online state: online
Type: ether
Path: pci-0000:0b:00.0
Driver: vmxnet3
Vendor: VMware
Model: VMXNET3 Ethernet Controller
Alternative Names: eno1
enp11s0
ens192
Hardware Address: 00:50:56:ba:43:98 (VMware, Inc.)
MTU: 1500 (min: 60, max: 9000)
QDisc: fq_codel
IPv6 Address Generation Mode: eui64
Number of Queues (Tx/Rx): 1/1
Auto negotiation: no
Speed: 10Gbps
Duplex: full
Port: tp
Address: 192.168.1.8/24 (DHCPv4 via 192.168.1.1)
fe80::250:56ff:feba:4398
Gateway: 192.168.1.1
DNS: 192.168.1.1
192.168.1.2
192.168.1.3
NTP: 192.168.1.1
192.168.1.2
192.168.1.3
192.168.1.4
Activation Policy: up
Required For Online: yes
DHCP4 Client ID: IAID:0xb6220feb/DUID
May 04 10:37:14 photon systemd-networkd[625]: eth0: found matching network '/etc/systemd/network/50-dhcp-en.network', based on potentially unpredictable interface name.
May 04 10:37:14 photon systemd-networkd[625]: eth0: Configuring with /etc/systemd/network/50-dhcp-en.network.
May 04 10:37:14 photon systemd-networkd[625]: eth0: Link UP
May 04 10:37:14 photon systemd-networkd[625]: eth0: Gained carrier
May 04 10:37:14 photon systemd-networkd[625]: eth0: found matching network '/etc/systemd/network/50-dhcp-en.network', based on potentially unpredictable interface name.