This page applies to those VPNs that use PPP – that is, PPTP and L2TP. The security settings (authentication and encryption) are irrelevant with L2TP, which uses IPsec for security. So for L2TP only the ‘IP address assignment’ section is
Windows to Draytek VPN using L2TP/IPsec with PSK
The good news here is that a Draytek, out-the-box, is already setup for L2TP/IPsec. Just add a pre-shared key, your usernames/passwords, and you are good to go. The other good news is that Windows also supports L2TP/IPsec out-of-box. Just add