DSVPN is a VPN tool designed for simplicity and ease of deployment across multiple operating systems.
The tool addresses the common use case of needing VPN connectivity without complex configuration overhead. It operates over TCP, making it functional on restricted networks where only TCP port 443 is available, such as public WiFi. The approach prioritizes minimal setup: users generate a shared secret key, run a single command on the server and another on the client, and the connection is established. The implementation uses formally verified modern cryptography, maintains a constant memory footprint with no heap allocations, and includes no external dependencies. The entire codebase is small and readable, with no configuration files or manual firewall rule adjustments required.
DSVPN suits developers and users who need straightforward VPN functionality without the complexity of traditional VPN software. It works out of the box on Linux, macOS, OpenBSD, and several BSD variants, with trivial extension to other operating systems. The tool is particularly valuable in environments with restrictive network policies or on resource-constrained devices like Raspberry Pi, where its small footprint and lack of heap allocations matter. It prevents IPv6 leaks by blocking IPv6 on the client side and avoids leaks between reconnects when the network remains stable. The README does not compare it to alternative VPN solutions.
Development activity shows consistent maintenance with straightforward issue resolution and practical enhancements. The project accepts contributions addressing real operational needs, such as systemd service files for integration with standard Linux service management. Documentation remains minimal by design, reflecting the philosophy that the tool should require no extensive reading to operate. The codebase has remained focused on its core purpose without scope creep into features outside the dead simple VPN use case.
