Disclosed is a method for granting access for a device to a private local network with a gateway device. The method includes: establishing a connection over the gateway device, wherein a request for accessing the private local network is transmitted; transmitting information on the device; receiving a request for preparing a setup of an authentication procedure; generating a pair of authentication keys; providing one of the generated authentication keys to the device requesting the access to the private local network; initiating the authentication procedure; granting access to the private local network for the device in response to a successful authentication procedure. The invention also relates to a gateway device, a computer program product and a system.