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Configuring preferred routing

Overview

Preferred routing is a useful feature when Parallels RAS users with different geo located deployments are connecting to the same Parallels RAS Farm/Site. A common access layer usage (RAS Secure Client Gateway, HALB, or a third-party load balancer) is not optimal if a resource is located in a different data center in the same RAS Farm/Site. The solution is to configure a preferred access layer server for a specific published resource, in which case any user would connect to a default Secure Client Gateway, but would be redirected using proximity rules set by the administrator. Typically, using the Secure Client Gateway closest to the session host provides improved user experience, reduced internal network traffic and associated costs along with providing better use of resources.

Note: Preferred routing doesn't apply to Azure Virtual Desktop published objects.

Here's how preferred routing works:

  1. Parallels Client establishes a connection with a Secure Client Gateway using a standard authentication.
  2. Through the RAS Publishing Agent, the resource's preferred route (if configured) is identified.
  3. Parallels Client receives the preferred public address to launch the resource.
  4. Parallels Client then tries to launch the resource through the redirected address and falls back to the original Gateway if it fails.

Configure preferred routing

To configure preferred routing for a published resource:

  1. In the RAS Console, select the Publishing category.
  2. Select an existing published resource and then select the Routing tab.
  3. Select the Enable preferred routing option.
  4. Click Tasks > Add. The Add preferred route dialog opens. Read on.

In the Add preferred route dialog:

  1. Type a name for this route and an optional description.
  2. From the Type drop-down list, select one of the following:
    • HALB Virtual Server: Select a RAS HALB virtual server from the list below the Type field. Note that for a RAS HALB virtual server to appear in the list, the HALB server must have a public address specified, as far as you cannot add HALB server here.
    • Gateway: Same as for HALB virtual server (described above), the Public address field must have a value for the Gateway to appear in the list. See the Public address field when you create or configure a RAS Secure Client Gateway.
    • Custom: A third-party load balancer will be used. Select this option, then click Tasks > Add and specify the server properties in the list below the field. The properties include Name, Description, Public address, Port, and SSL port. You can add as many servers as required and then select one of them to be used for a given published resource.

When configuring preferred routing, please also consider the following:

  • If routing fails, an automatic fallback to the originating address is carried out.
  • If routing is enabled in the RAS Console, but not configured, the administrator will see an error message and will have to either configure or disable it.
  • It is recommended to use Folders (configured for administrative purpose) in case routing needs to be configured on many resources. Routes are not inherited from parent folder if the routing is enabled on the child object, i.e. only one set of routes is used.
  • Same user credentials will be used when redirecting the RDP traffic to the same RAS Site. Users will not be asked to re-enter credentials.
  • If you had existing session tunneled in a particular Secure Client Gateway and using session sharing, the same session workflow path will be used (if a published resource is also available on the same session host) irrespective of configured routing.
  • Routing is supported in SAML environments.
  • Supported clients are Windows, macOS, Linux, Android, iOS, HTML5.

Specifying public address when inviting users

When you use the Invite Users wizard, you can specify a public address on the second page where you specify target platforms and connection options. This way, you can set a preferred routing for a group of users in a specific geo location. For more information, see Invite users.

Deleting or disabling Gateway or HALBs

If an administrator tries to delete a Gateway or HALB when they are being used as preferred routing, the information about objects using it will be shown on the screen, so no accidental deletion takes place.
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