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>
(ens33 is an example)
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 fedora systemd-networkd[650]: ens33: Link UP
Feb 26 10:19:44 fedora systemd-networkd[650]: ens33: Gained carrier
Feb 26 10:19:45 fedora systemd-networkd[650]: ens33: DHCPv4 address 172.16.85.225/24 via 172.16.85.2
Feb 26 10:19:46 fedora systemd-networkd[650]: ens33: Gained IPv6LL