Hi. I did som further investigation here, and I think I've figured out what happens in networkd here.
Aug 21 10:54:45 nettest1 systemd-networkd[5463]: ens3: Removing address: 2001:700:1d00:ec00:5054:ff:fe49:4bc9/64 (valid for 4w 2d) Aug 21 10:54:46 nettest1 systemd-networkd[5463]: ens3: Removing address: 10.212.128.84/24 (valid for 11h 57min 54s) Aug 21 10:54:46 nettest1 systemd-networkd[5463]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1/link/_32 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=17 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a Aug 21 10:54:46 nettest1 systemd-networkd[5463]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=18 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a Aug 21 10:54:46 nettest1 systemd-networkd[5463]: ens3: Routing policy rule configured Aug 21 10:54:46 nettest1 systemd-networkd[5463]: ens3: Could not set route: Network is unreachable Aug 21 10:54:46 nettest1 systemd-networkd[5463]: ens3: Routes set Aug 21 10:54:46 nettest1 systemd-networkd[5463]: ens3: Adding address: 10.212.128.84/24 (valid for 12h) Aug 21 10:54:46 nettest1 systemd-networkd[5463]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1/link/_32 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=19 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a Aug 21 10:54:46 nettest1 systemd-networkd[5463]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=20 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a Aug 21 10:54:46 nettest1 systemd-networkd[5463]: ens3: Configured Basically it seems like networkd does the following on "netplan apply": 1) Remove every address 2) Add routes - which of course will fail with "network is unreachable" because the interfaces don't have an address yet 3) Adding the addresses -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1836695 Title: Netplan ignores static routes when using DHCP To manage notifications about this bug go to: https://bugs.launchpad.net/netplan/+bug/1836695/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs