The access mode for Smart Cache (FKA 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 Smart Cache (FKA 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 Smart Cache (FKA Turbo) Device.