kvm NET 和 BRIDGE

net:

    <interface type='network'>
      <mac address='52:54:00:e1:ac:43'/>
      <source network='default'/>
      <model type='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
    </interface>

bridge:

    <interface type='bridge'>
      <mac address='52:54:00:19:77:8c'/>
      <source bridge='br0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
    </interface>