Following router schedule rules that I change often, the stock firmware on my
D-Link 825NA rev. B redirects HTTP requests to a built-in "Access denied!" warning at appointed times.
I just upgraded to
DD-WRT v24-sp2 (02/17/11) std - build 16214 but its "Access Restrictions" don't give any HTML cut-off reminders my users have come to expect. They mistake the router's DROP rules for connection problems and hit refresh uselessly when blocked in not-so-obvious afternoon hours.
The router has 8MB flash and I'm quite ready to mess around in the shell. Online forums talks about nothing but iptables, which allows / denies but never takes over with custom messages IIRC.
How can DD-WRT show an HTML page warning selected users that the access restrictions block is in effect?