Comment 42 for bug 1860926

eoan:

root@lp1860926-e:~# cat /etc/netplan/50-cloud-init.yaml
# This file is generated from information provided by the datasource. Changes
# to it will not persist across an instance reboot. To disable cloud-init's
# network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}
network:
  version: 2
  renderer: networkd
  bridges:
    br0:
      dhcp4: no
      addresses: [192.168.0.4/24]
      gateway4: 192.168.0.1
      nameservers:
        search: [mydomain]
        addresses: [192.168.0.1,192.168.0.2,192.168.0.3]

root@lp1860926-e:~# dpkg -l systemd|grep systemd
ii systemd 242-7ubuntu3.8 amd64 system and service manager
root@lp1860926-e:~# netplan apply
root@lp1860926-e:~# ip a show br0
2: br0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
    link/ether 7a:1e:9f:13:ec:e4 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.4/24 brd 192.168.0.255 scope global br0
       valid_lft forever preferred_lft forever
root@lp1860926-e:~# ip l set up dev eth0 master br0
root@lp1860926-e:~# ip a show br0
2: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 7a:1e:9f:13:ec:e4 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.4/24 brd 192.168.0.255 scope global br0
       valid_lft forever preferred_lft forever
    inet6 fe80::781e:9fff:fe13:ece4/64 scope link
       valid_lft forever preferred_lft forever
root@lp1860926-e:~# ip l set dev eth0 nomaster
root@lp1860926-e:~# ip a show br0
2: br0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
    link/ether 7a:1e:9f:13:ec:e4 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::781e:9fff:fe13:ece4/64 scope link
       valid_lft forever preferred_lft forever

root@lp1860926-e:~# dpkg -l systemd|grep systemd
ii systemd 242-7ubuntu3.9 amd64 system and service manager
root@lp1860926-e:~# netplan apply
root@lp1860926-e:~# ip a show br0
2: br0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
    link/ether 7a:1e:9f:13:ec:e4 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.4/24 brd 192.168.0.255 scope global br0
       valid_lft forever preferred_lft forever
root@lp1860926-e:~# ip l set dev eth0 up master br0
root@lp1860926-e:~# ip a show br0
2: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 7a:1e:9f:13:ec:e4 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.4/24 brd 192.168.0.255 scope global br0
       valid_lft forever preferred_lft forever
    inet6 fe80::781e:9fff:fe13:ece4/64 scope link
       valid_lft forever preferred_lft forever
root@lp1860926-e:~# ip l set dev eth0 nomaster
root@lp1860926-e:~# ip a show br0
2: br0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
    link/ether 7a:1e:9f:13:ec:e4 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.4/24 brd 192.168.0.255 scope global br0
       valid_lft forever preferred_lft forever
    inet6 fe80::781e:9fff:fe13:ece4/64 scope link
       valid_lft forever preferred_lft forever