Easy easy install of openwrt on the GL-MT300N i must say ...
I wanted to setup a guest wifi that had time of day limitations to keep my kids off the net during sleep times ...
I found a guide but my pages are different and i couldnt figure how to get further along ... i have two active wifi interfaces active with security and thats about as far as i got
If you block them at the router you have only partially solved the issue. This is because the kids can simply connect over 4G and bypass all your hard work. Making parental controls work demands a client side approach where you install the app on their phones/laptops. Something like Kaspersky Safe Kids for example which also provides content filtering