This page will show you how to configure a Kill Switch, when using Asus Merlin.
A Kill Switch, will prevent your devices from accessing the internet should the VPN become disconnected - to prevent IP leakage, via your real broadband IP address.
You must have a Residential VPN account to use this service.
Make sure your computer is connected to the 'StreamVia VPN' wifi network, or whatever you called your new VPN wifi network.
In a browser, open the below page - this will open the router configuration screen:
Login to the router, with the router username/password you created during setup.
Advanced Settings → VPN → VPN Client → OpenVPN
Scroll down to where it shows 'Killswitch - Block router clients if tunnel goes down', set this to 'Yes'
Scroll down to the bottom of the page, then click 'Apply' to save the settings change
Now, if the VPN disconnects, your devices will NOT be able to access the internet (to leak your real IP address), until the VPN connects again.