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Configuring HALB in the RAS Console

To configure High Availability Load Balancing In the RAS console, navigate to Farm / <Site> / HALB. On the HALB tab in the right pane, select the Enable HALB option. This will enable the remaining options and will also show the Devices tab. Configure the options on each tab as described below.

HALB tab options

Specify the following options in the Virtual IP section:

  • Select the IP version (IPV4, IPV6, or both) that you would like to use.
  • Specify the IP address (or addresses if both version are selected) and their corresponding property (subnet mask, prefix). This is the IP address that clients will connect to. This will also be a floating IP address used by this and other HALB appliances.

To load-balance normal gateway connections, select the LB Gateway Payload option and then click Configure. In the HALB Configuration dialog that opens, specify the following: 

  1. The port number that will be used by HALB appliances to forward traffic to gateways (the port configured on the gateway).
  2. Select the gateways that the HALB appliance will load-balance.
  3. Click OK.

To load-balance SSL connections, select the LB SSL Payload option and then click Configure. In the the HALB Configuration dialog, specify the following:

  1. The port number that will be used by HALB appliances to forward traffic to gateways (443 by default).
  2. In the Mode drop-down list, select Passthrough or SSL Offloading to specify where the SSL decryption process is performed. By default, the SSL connections are tunneled directly to gateways (referred to as passthrough) where the SSL decryption process is performed.

    If you select the SSL Offloading mode, click Configure. The SSL dialog opens.The SSL Offloading mode requires an SSL certificate to be assigned to HALB. Specify the following options in the SSL dialog to configure SSL:

    • Accepted SSL Versions. Select an SSL version.
    • Cipher Strength. Select the cipher strength of your choice. To specify a custom cipher, select Custom and then specify the cipher in the Cipher field.
    • In the Certificates drop-down list, select a desired certificate. For the information on how to create a new certificate and make it appear in this list, see the SSL Certificate Management chapter.

      The <All matching usage> option will use any certificate configured to be used by HALB. When you create a certificate, you specify the "Usage" property where you can select "Gateway", "HALB", or both. If this property has the "HALB" option selected, it can be used with HALB. Please note that if you select this option, but not a single certificate matching it exists, you will see a warning and will have to create a certificate first.

    Click OK to close the SSL dialog.

  3. Back in the HALB Configuration dialog, select the gateways that the HALB appliance will load-balance and click OK to save your changes and close the dialog.

Configure the remaining properties on the HALB tab:

  1. Select the Client Management option to enable management of Windows devices connected through HALB. Click Configure and select gateways that will mange the devices.
  2. Select the Enable RDP UDP Data Tunneling option to enable UDP tunneling on Windows devices.
  3. The Maximum sessions per device property specifies the maximum number of simultaneous connections allowed. Use the default value or specify your own.

Devices tab options

Click the Devices tab to add HALB appliances that will be managed by this Farm. To add appliances:

  1. Click Tasks > Add (or click the + icon) to bring up the Add HALB Devices dialog.

    Parallels RAS is capable of detecting HALB appliances over the network and display them as a list. Selecting detected HALB appliances from this list is the preferred method for adding new appliances. If an appliance cannot be detected, you can add it manually by specifying the appliance IP address in the IP Address field.

  2. Click OK to close the Add HALB Devices dialog. The appliance is initialized and added to the list on the Devices tab.
  3. Finally, click Apply for the new HALB configuration to be applied to all added HALB appliances.

For additional information, please see the following KB article: https://kb.parallels.com/123607
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