Tailscale Deep Dive: Why Developers Are Ditching Traditional VPNs

Every developer I know who tries Tailscale has the same reaction: "Wait, that's it? It just... works?" That reaction is the entire product thesis. VPN setup has been painful for decades — configuring OpenVPN, managing certificates, debugging NAT traversal, opening firewall ports. Tailscale makes it feel like connecting to WiFi. But the engineering underneath is anything but simple. Here's what's actually happening when you install Tailscale and everything "just works." The Foundation: WireGuard Tailscale is built on WireGuard, and understanding WireGuard is essential to understanding why Tailscale performs so well. WireGuard is a VPN protocol created by Jason Donenfeld. Compared to its predecessors: OpenVPN IPsec WireGuard Lines of code ~100,000 ~400,000 ~4,000 Encryption Configurable (TLS) Configurable (IKE) Fixed (ChaCha20, Curve25519) Handshake Multi-round Complex (IKE phases) 1-RTT Kernel integration Userspace Kernel module Kernel module Connection setup Seconds Seconds Millisecond