The access mode for Smart Cache (Turbo) devices can be changed from Group-based IP Range-based.
To set access to IP Ranges you need to go to Devices administration panel on your domain:
Administration panel -> Devices -> Storage Devices -> <Device Name> -> Settings -> Access Rules
By default, all domain users will be able to discover the Turbo Device. It is possible to limit the discoverability by adding IP Range rules. Once a rule is set, only Desktop App users whose device's internal IP(s) match (one or more of) the rules will be able to access the Turbo Device.