Comment 4 for bug 1833193

Repro instructions:
- (Enable systemd-networkd debug logging)
- Start a server with its interface configured with DHCP
- In the netplan config, configure the interface wtih static addressing, using the exact same address as it already has gotten from DHCP
- Either wait for the initial DHCP lease time to expire, and observe that the interface loses its address; OR observe in the debug log that networkd applied the address with a lease time, even though you told netplan to use static addressing

Networkd config with static addressing:
cat /run/systemd/network/10-netplan-ens3.network
[Match]
MACAddress=<redacted>

[Network]
LinkLocalAddressing=ipv6
Address=10.212.132.107/24
Gateway=10.212.132.1
DNS=8.8.8.8
DNS=8.8.4.4
Domains=<redacted>

Networkd config with DHCP:
cat /run/systemd/network/10-netplan-ens3.network
[Match]
MACAddress=<redacted>
[Network]
DHCP=ipv4
LinkLocalAddressing=ipv6

[DHCP]
RouteMetric=100
UseMTU=true

Debug log output from systemd-networkd when netplan tells it to apply static addressing when the interface already has an address from DHCP:
Sep 30 10:36:15 nettest1 systemd[1]: Stopped Network Service.
Sep 30 10:36:16 nettest1 systemd[1]: Starting Network Service...
<snip>
Sep 30 10:36:16 nettest1 systemd-networkd[6086]: ens3: Adding address: 10.212.132.107/24 (valid for 11h 52min 55s)