| CPC H04L 67/145 (2013.01) [H04L 12/4641 (2013.01); H04L 43/0811 (2013.01); H04L 45/22 (2013.01); H04L 47/76 (2013.01); H04L 47/78 (2013.01); H04L 63/0272 (2013.01); H04L 67/141 (2013.01)] | 20 Claims |
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1. A method comprising:
allocating, by one or more machines of a virtual private network (VPN) service provider infrastructure (SPI), resources of the VPN SPI to a client device to enable the client device to communicate via a VPN associated with the VPN SPI in response to receiving a VPN connection request from the client device;
monitoring VPN activity of the client device by receiving handshake notifications from the client device, wherein receiving the handshake notifications comprises:
receiving requests, from the client device after the client device was granted access to the VPN, to download or upload data via the VPN, wherein at least a portion of the requests are received according to a schedule, wherein the schedule corresponds to a VPN-connected phase, wherein, upon the client device losing connection to the VPN, the schedule switches to a connection lost phase specifying that a time difference between transmission, by the client device, of at least one pair of successive packets is an exponential function of a number of packets sent since the connection was lost, and
storing timestamps associated with the requests to download or upload the data;
in response to monitoring the VPN activity of the client device, determining that the client device has not communicated via the VPN for at least a threshold time period based on a calculated time difference between a current time and a stored timestamp of a latest-in-time handshake notification from the client device, wherein the threshold time period is determined based on a corresponding phase of the schedule; and
adding the resources allocated to the client device to a resource pool for provision to devices connecting to the VPN.
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