router config with open PPPoE

Hi, I Have a small ISP with PPPoE Service
Sometimes i have internet problem from the source, so i need to do another router with mikrotik 3.10 or later
to use it as ad system by swiching from the main internet router to the ad router, for example:
i want to make the new router like any body got PPPoE Connection can login with any username and password, its like open domain
and in the same time make any http request redirects to a webpage with an ad on it like " THE INTERNET NOT AVAILABLE RIGHT NOW " or something like that.

any help?

There is a bit complicated solution.
You need,

-remote web-server running, where main page contains information about problems with Internet.

  • script on the router, which enables transparent web-proxy and redirects HTTP traffic to remote web-server address, which informs about Internet connection problems.

I can be wrong since i dont have a lot of experience, but why you dont set a hotspot with no valid user at all just showing the page you want. If the client dont connect to PPPoE it will automatically go to hotspot login page. If you need more filters, just write a script in the primary router and place on scheduler to verify every few seconds if its all running ok, or else redirect to ad-router with hotspot! I think maybe this would work fine!