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The two machines in question have different MAC addresses for eth0. However, when I apply the following netplan file, I end up with the same mac address on both machines, which, of course, is kind of a problem. I'm using ubuntu 18.04.1 on arm.

network:
  version: 2
  renderer: networkd
  ethernets:
    eth0:
    dhcp4: no

  bridges:
    br0:
    interfaces: [eth0]
    dhcp4: true
  • MAC addresses, or IP addresses? – heynnema Mar 16 at 14:52
  • mac addresses. From below, I can work around it by assigning them. – rory toma Mar 18 at 21:27
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network:
  version: 2
  renderer: networkd
  ethernets:
    eth0:
    dhcp4: no

  bridges:
    br0:
    macaddress: 00:1a:3e:c9:20:03
    interfaces: [eth0]
    dhcp4: true

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