This seems interesting and a modern vpn altenative to tinc, openvpn and its wicked fast! and simple to setup

"WireGuard is a secure network tunnel, operating at layer 3, implemented as a kernel virtual network interface for Linux, which aims to replace both IPsec for most use cases, as well as popular user space and/or
TLS-based solutions like OpenVPN, while being more secure, more performant, and easier to use. "

https://www.wireguard.com