L2TP protocol 1

• Anonine: set up the PPTP or L2TP connection on your ASUS router

OpenVPN protocol 4

• Anonine: OpenVPN - DD-WRT Manual Configuration
• Anonine: OpenVPN - Tomato Manual Configuration
• Anonine: OpenVPN - pfSense Manual Configuration
• Anonine: set up OpenVPN connection on your ASUS router

IPsec protocol 1

• IPsec IKEv2 Setup Guide for Mikrotik