What benefits does port knocking give over and above a simple VPN? They're both additional layers of authentication, except a VPN seems much more rigorous and brings potentially other benefits.
In a world where tailscale etc. have made quality VPNs trivial to implement, why would I both with port knocking?
In a world where tailscale etc. have made quality VPNs trivial to implement, why would I both with port knocking?