{
  # ddns-domainname (aka qualifying-suffix)
  "Dhcp6": {
    "dhcp-ddns": {
      "enable-updates": false,
      "qualifying-suffix": ".biz"
    },
    "client-classes": [
      # embedded
      {
        "name": "foo"
//      /// Only global qualifying-suffix is supported
//      "qualifying-suffix": ".bar"
      }
    ]
  }
}