WRT3200ACM firewall rules (offline manutencaoa time)

Hello friends,

I need to block all the internet traffic coming out on my router on certain days and times and directing it to a maintenance warning page, which I thought of putting in the / tmp folder of the router, so all the clients logged on to this information page.

but I need to have remote access to be able to do this maintenance as I usually do them remotely, so I count on the help of the more experienced friends that I have, to guide me on how to do this procedure that I believe to be simple

Thank you very much in advance.