Otdfbt

I'm trying to set a different MAC address on one of my interfaces, but my attempts following the netplan documentation result in no change. This is on Ubuntu 18.04.

network:
 ethernets:
 enp10s0:
 addresses: []
 dhcp4: true
 optional: true
 routes:
 - to: 0.0.0.0/0
 via: 10.0.0.1
 enp5s0:
 addresses: []
 dhcp4: true
 macaddress: aa:bb:cc:ff:ff:ff
 optional: true
 routes:
 - to: 239.0.0.0/8
 via: 10.10.0.1
 version: 2

After running netplan generate and netplan apply, and also rebooting, there is no change to the macaddress of enp5s0

enp10s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
 inet 10.0.0.227 netmask 255.255.255.0 broadcast 10.0.0.255
 inet6 fe80::7285:c2ff:fe53:119c prefixlen 64 scopeid 0x20<link>
 ether 70:85:c2:53:11:9c txqueuelen 1000 (Ethernet)
 RX packets 3623 bytes 1557193 (1.5 MB)
 RX errors 0 dropped 0 overruns 0 frame 0
 TX packets 3066 bytes 291335 (291.3 KB)
 TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

enp5s0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
 ether 68:05:ca:61:a8:fc txqueuelen 1000 (Ethernet)
 RX packets 0 bytes 0 (0.0 B)
 RX errors 0 dropped 0 overruns 0 frame 0
 TX packets 0 bytes 0 (0.0 B)
 TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
 device interrupt 34 memory 0xfd4c0000-fd4e0000

What have I missed?

I believe it only changes the MAC address that gets reported to the external connection. Running ifconfig locally will always give you the interface's real MAC address.

All right, I had the same problem but I finally got fixed by adding a match keyword in my script, my MAC address was 4c:ed:fe:32:de:22 and I had to specify it before changing it or forcing it. (I also added a renderer which is networkd)

network:
 renderer: networkd
 ethernets:
 eno1:
 addresses: []
 dhcp4: true
 optional: true
 enp1s0:
 match:
 macaddress: 4c:ed:fe:32:de:22
 macaddress: de:de:de:de:de:de
 dhcp4: no
 dhcp6: no
 addresses: [172.30.0.58/24, ]
 gateway4: 172.30.0.254
 nameservers:
 addresses: [208.67.222.222, 208.67.220.220]
 version: 2

I sincerely hope this helps you buddy :)

I had the same problem that Netplan didn't override the MAC address on Ubuntu Server 18.04, although I used a match clause as described in the netplan reference before setting the new MAC address.

The workaround was to create a separate systemd link configuration under /etc/systemd/network/10-override-mac.link to override the MAC address of the NIC and configure the rest via netplan.

[Match]
MacAddress=52:54:00:6b:3c:58

[Link]
MACAddress=52:54:00:6b:3c:59