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) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1833193 Title: systemd-networkd fails to apply static IPv4 when the static IP is the same as previously configured by DHCP To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1833193/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
