Hi! 

I want to set my Archer C64 router, when I run the given mode from the admin panel, when users try to access ANY SITE, to redirect them to some other web page (URL).
I'm aiming for this as I'm shutting down the router this week and instead, I think it would be more interesting to make it so that when someone connects and tries to open a browser, it redirects them to a page that says "Network is temporarily unavailable"

I'm not sure if this is called a Captive Portal as it doesn't require a Login or anything, it's just an informational page.
I would appreciate it if someone could give me instructions, because this is a simple thing and I'm sure there's a way to set it on the router :))