Essential but complex. Setting up an L2TP/IPsec server on MikroTik (RouterOS) is a rite of passage for network administrators. While the protocol is robust and supported natively by almost all operating systems (Windows, macOS, iOS, Android), the setup on MikroTik is notoriously "clicky." It requires synchronizing three different modules (PPP, IPsec, and Firewall) to work correctly.