parameter_defaults:
  ControlPlaneSubnetCidr: "24"
  ControlPlaneDefaultRoute: "192.0.2.1"
  EC2MetadataIp: "192.0.2.1"
  ExternalInterfaceDefaultRoute: "192.0.3.251"
  ExternalNetCidr: "192.0.3.1/24"
  ExternalAllocationPools: [{'start': '192.0.3.30', 'end': '192.0.3.100'}]
  NeutronExternalNetworkBridge: "''"
  NovaComputeLibvirtType: "qemu"
  DnsServers: ["8.8.8.8"]

parameter_defaults:
  ControlPlaneSubnetCidr: "24"
  ControlPlaneDefaultRoute: "192.0.2.1"
  EC2MetadataIp: "192.0.2.1"
  ExternalInterfaceDefaultRoute: "192.0.3.251"
  ExternalNetCidr: "192.0.3.1/24"
  ExternalAllocationPools: [{'start': '192.0.3.30', 'end': '192.0.3.100'}]
  NeutronExternalNetworkBridge: "''"
  NovaComputeLibvirtType: "qemu"
  DnsServers: ["192.168.122.1"]

Use virt host as dns server
Use virt host as dns server
