Comment 4 for bug 1929560

$ cat /etc/systemd/network/10-ens3.network
[Match]
Name=ens3

[Link]
MACAddress=00:16:3e:ff:ff:ff

[Network]
DHCP=yes

ubuntu@lp1929560-g:~$ dpkg -l systemd|grep systemd
ii systemd 246.6-1ubuntu1.3 amd64 system and service manager
ubuntu@lp1929560-g:~$ ip l show dev ens3
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
    link/ether 52:54:00:be:9d:58 brd ff:ff:ff:ff:ff:ff
    altname enp0s3
ubuntu@lp1929560-g:~$ sudo systemctl restart systemd-networkd
ubuntu@lp1929560-g:~$ ip l show dev ens3
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
    link/ether 52:54:00:be:9d:58 brd ff:ff:ff:ff:ff:ff
    altname enp0s3
ubuntu@lp1929560-g:~$ sudo ip l set down dev ens3
ubuntu@lp1929560-g:~$ ip l show dev ens3
2: ens3: <BROADCAST,MULTICAST> mtu 1500 qdisc fq_codel state DOWN mode DEFAULT group default qlen 1000
    link/ether 52:54:00:be:9d:58 brd ff:ff:ff:ff:ff:ff
    altname enp0s3
ubuntu@lp1929560-g:~$ sudo systemctl restart systemd-networkd
ubuntu@lp1929560-g:~$ ip l show dev ens3
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
    link/ether 00:16:3e:ff:ff:ff brd ff:ff:ff:ff:ff:ff permaddr 52:54:00:be:9d:58
    altname enp0s3

ubuntu@lp1929560-g:~$ dpkg -l systemd|grep systemd
ii systemd 246.6-1ubuntu1.4 amd64 system and service manager
ubuntu@lp1929560-g:~$ ip l show dev ens3
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
    link/ether 52:54:00:be:9d:58 brd ff:ff:ff:ff:ff:ff
    altname enp0s3
ubuntu@lp1929560-g:~$ sudo systemctl restart systemd-networkd
ubuntu@lp1929560-g:~$ ip l show dev ens3
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
    link/ether 00:16:3e:ff:ff:ff brd ff:ff:ff:ff:ff:ff permaddr 52:54:00:be:9d:58
    altname enp0s3