Thanks for quick response tomaskir but please could you elaborate -remember I have only just started on ROS?

I have used Tomaskir's load balancing video & slides for a 2 WAN setup. http://tiktube.com/video/DofH3iFnjDJomGEoIDFqnrquKlEoLqHq= I need to use VPN (IPsec attempted) to connect 4 routers for WISP monitoring purposes. I cannot figure out how to 'require' the VPN connections to use one WAN over t...