VPN IP Address Reclamation via Handshake Timeout
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Solution Overview
Problem
Existing VPN systems face challenges in efficiently managing VPN connections, leading to resource wastage as allocated IP addresses are not promptly reallocated to other devices after a client device becomes inactive, resulting in reduced availability and efficiency.
Innovation Solution
Implementing a method for VPN connection status detection that involves selecting an IP address for a client device, receiving handshake notifications, determining a threshold time period of inactivity, disconnecting the client device, and adding the IP address back to the pool, ensuring resources are reallocated efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If IP addresses are allocated to client devices for VPN access, then VPN connection availability is improved, but resource wastage occurs when allocated IP addresses are not promptly reallocated to other devices after client inactivity
Solution Approach 1:
The system implements a feedback mechanism by monitoring handshake notifications from client devices to detect connection status. When no handshake notification is received within a threshold time period, the system automatically disconnects the client and reallocates the IP address, ensuring resources are not wasted while maintaining availability for active users.
Solution Approach 2:
The IP address allocation system dynamically adjusts resource allocation based on real-time connection status. IP addresses are allocated when needed and automatically reclaimed when connections become inactive, creating a dynamic resource management system that balances availability with efficiency.
2Ease of operation
If IP addresses are held reserved for inactive client devices, then connection reestablishment is facilitated, but IP address availability for other devices is reduced
Solution Approach 1:
The system performs preliminary allocation of IP addresses to client devices that request VPN access. This preliminary action facilitates quick reestablishment of connections for returning clients while the monitoring mechanism ensures that addresses are reclaimed promptly when inactivity is detected, balancing ease of reconnection with overall address availability.
3Productivity
If continuous monitoring of VPN connections is implemented, then resource reallocation efficiency is improved, but system complexity increases
Solution Approach 1:
The monitoring system uses a simple feedback loop based on handshake notifications already exchanged during VPN connection establishment. By listening for the absence of expected handshake notifications within a threshold time period, the system achieves efficient resource reallocation without requiring complex continuous monitoring protocols, thus maintaining low system complexity while improving productivity.
Data Source
AI summary
Virtual private network (VPN) service provider infrastructure (SPI) receives a request to access a VPN from a client device. The VPN SPI selects an Internet Protocol (IP) address for access to the VPN by the client device from a pool of IP addresses. The VPN SPI provides access to the VPN for the client device via the IP address. The VPN SPI receives one or more handshake notifications from the client device. The VPN SPI determines that a threshold time period has passed since a latest-in-time handshake notification of the one or more handshake notifications. The VPN SPI disconnects the client device from the VPN in response to determining that the threshold time period has passed. The VPN SPI adds the IP address to the pool of IP addresses in response to disconnecting the client device from the VPN.