{
  "STRUCTURE": {
    "com.vmware.vcenter.guest.customization_specs.spec": {
      "description": "This is a generic ipv4 customizationSpec for linux VM customization. Created by VIM API",
      "name": "defaultCustSpec01",
      "spec": {
        "STRUCTURE": {
          "com.vmware.vcenter.guest.customization_spec": {
            "configuration_spec": {
              "STRUCTURE": {
                "com.vmware.vcenter.guest.configuration_spec": {
                  "linux_config": {
                    "OPTIONAL": {
                      "STRUCTURE": {
                        "com.vmware.vcenter.guest.linux_configuration": {
                          "domain": "VMWare.com",
                          "hostname": {
                            "STRUCTURE": {
                              "com.vmware.vcenter.guest.hostname_generator": {
                                "fixed_name": {
                                  "OPTIONAL": "vapiCustName123"
                                },
                                "prefix": {
                                  "OPTIONAL": null
                                },
                                "type": "FIXED"
                              }
                            }
                          },
                          "time_zone": {
                            "OPTIONAL": null
                          },
                          "script_text": {
                            "OPTIONAL": null
                          }
                        }
                      }
                    }
                  },
                  "windows_config": {
                    "OPTIONAL": null
                  }
                }
              }
            },
            "global_DNS_settings": {
              "STRUCTURE": {
                "com.vmware.vcenter.guest.global_DNS_settings": {
                  "dns_servers": {
                    "OPTIONAL": []
                  },
                  "dns_suffix_list": {
                    "OPTIONAL": []
                  }
                }
              }
            },
            "interfaces": [
              {
                "STRUCTURE": {
                  "com.vmware.vcenter.guest.adapter_mapping": {
                    "adapter": {
                      "STRUCTURE": {
                        "com.vmware.vcenter.guest.IP_settings": {
                          "ipv4": {
                            "OPTIONAL": {
                              "STRUCTURE": {
                                "com.vmware.vcenter.guest.ipv4": {
                                  "gateways": {
                                    "OPTIONAL": [
                                      "192.168.12.1"
                                    ]
                                  },
                                  "ip_address": {
                                    "OPTIONAL": "192.168.12.11"
                                  },
                                  "prefix": {
                                    "OPTIONAL": 31
                                  },
                                  "type": "STATIC"
                                }
                              }
                            }
                          },
                          "ipv6": {
                            "OPTIONAL": null
                          },
                          "windows": {
                            "OPTIONAL": null
                          }
                        }
                      }
                    },
                    "mac_address": {
                      "OPTIONAL": null
                    }
                  }
                }
              }
            ]
          }
        }
      }
    }
  }
}