func expandAzureRmLoadBalancerFrontendIpConfigurations(d *schema.ResourceData) *[]network.FrontendIPConfiguration {
	configs := d.Get("frontend_ip_configuration").([]interface{})
	frontEndConfigs := make([]network.FrontendIPConfiguration, 0, len(configs))

	for _, configRaw := range configs {
		data := configRaw.(map[string]interface{})

		private_ip_allocation_method := data["private_ip_address_allocation"].(string)
		properties := network.FrontendIPConfigurationPropertiesFormat{
			PrivateIPAllocationMethod: network.IPAllocationMethod(private_ip_allocation_method),
		}

		if v := data["private_ip_address"].(string); v != "" {
			properties.PrivateIPAddress = &v
		}

		if v := data["public_ip_address_id"].(string); v != "" {
			properties.PublicIPAddress = &network.PublicIPAddress{
				ID: &v,
			}
		}

		if v := data["subnet_id"].(string); v != "" {
			properties.Subnet = &network.Subnet{
				ID: &v,
			}
		}

		name := data["name"].(string)
		frontEndConfig := network.FrontendIPConfiguration{
			Name:       &name,
			Properties: &properties,
		}

		frontEndConfigs = append(frontEndConfigs, frontEndConfig)
	}

	return &frontEndConfigs
}
func resourceArmPublicIpCreate(d *schema.ResourceData, meta interface{}) error {
	client := meta.(*ArmClient)
	publicIPClient := client.publicIPClient

	log.Printf("[INFO] preparing arguments for Azure ARM Public IP creation.")

	name := d.Get("name").(string)
	location := d.Get("location").(string)
	resGroup := d.Get("resource_group_name").(string)
	tags := d.Get("tags").(map[string]interface{})

	properties := network.PublicIPAddressPropertiesFormat{
		PublicIPAllocationMethod: network.IPAllocationMethod(d.Get("public_ip_address_allocation").(string)),
	}

	dnl, hasDnl := d.GetOk("domain_name_label")
	rfqdn, hasRfqdn := d.GetOk("reverse_fqdn")

	if hasDnl || hasRfqdn {
		dnsSettings := network.PublicIPAddressDNSSettings{}

		if hasRfqdn {
			reverse_fqdn := rfqdn.(string)
			dnsSettings.ReverseFqdn = &reverse_fqdn
		}

		if hasDnl {
			domain_name_label := dnl.(string)
			dnsSettings.DomainNameLabel = &domain_name_label

		}

		properties.DNSSettings = &dnsSettings
	}

	if v, ok := d.GetOk("idle_timeout_in_minutes"); ok {
		idle_timeout := int32(v.(int))
		properties.IdleTimeoutInMinutes = &idle_timeout
	}

	publicIp := network.PublicIPAddress{
		Name:       &name,
		Location:   &location,
		Properties: &properties,
		Tags:       expandTags(tags),
	}

	_, err := publicIPClient.CreateOrUpdate(resGroup, name, publicIp, make(chan struct{}))
	if err != nil {
		return err
	}

	read, err := publicIPClient.Get(resGroup, name, "")
	if err != nil {
		return err
	}
	if read.ID == nil {
		return fmt.Errorf("Cannot read Public IP %s (resource group %s) ID", name, resGroup)
	}

	d.SetId(*read.ID)

	return resourceArmPublicIpRead(d, meta)
}
func resourceArmPublicIpCreate(d *schema.ResourceData, meta interface{}) error {
	client := meta.(*ArmClient)
	publicIPClient := client.publicIPClient

	log.Printf("[INFO] preparing arguments for Azure ARM Public IP creation.")

	name := d.Get("name").(string)
	location := d.Get("location").(string)
	resGroup := d.Get("resource_group_name").(string)

	properties := network.PublicIPAddressPropertiesFormat{
		PublicIPAllocationMethod: network.IPAllocationMethod(d.Get("public_ip_address_allocation").(string)),
	}

	dnl, hasDnl := d.GetOk("domain_name_label")
	rfqdn, hasRfqdn := d.GetOk("reverse_fqdn")

	if hasDnl || hasRfqdn {
		dnsSettings := network.PublicIPAddressDNSSettings{}

		if hasRfqdn {
			reverse_fqdn := rfqdn.(string)
			dnsSettings.ReverseFqdn = &reverse_fqdn
		}

		if hasDnl {
			domain_name_label := dnl.(string)
			dnsSettings.DomainNameLabel = &domain_name_label

		}

		properties.DNSSettings = &dnsSettings
	}

	if v, ok := d.GetOk("idle_timeout_in_minutes"); ok {
		idle_timeout := v.(int)
		properties.IdleTimeoutInMinutes = &idle_timeout
	}

	publicIp := network.PublicIPAddress{
		Name:       &name,
		Location:   &location,
		Properties: &properties,
	}

	resp, err := publicIPClient.CreateOrUpdate(resGroup, name, publicIp)
	if err != nil {
		return err
	}

	d.SetId(*resp.ID)

	log.Printf("[DEBUG] Waiting for Public IP (%s) to become available", name)
	stateConf := &resource.StateChangeConf{
		Pending: []string{"Accepted", "Updating"},
		Target:  "Succeeded",
		Refresh: publicIPStateRefreshFunc(client, resGroup, name),
		Timeout: 10 * time.Minute,
	}
	if _, err := stateConf.WaitForState(); err != nil {
		return fmt.Errorf("Error waiting for Public IP (%s) to become available: %s", name, err)
	}

	return resourceArmPublicIpRead(d, meta)
}