@terziyski randomized mac addresses won't affect parental control since archer routers give prefix ip kind of static ip to devices so even if randomized mac particular device would get same ip over...

@Vvet maybe their devices got alternate dns rather than your router's like check dhcp settings in your router and make sure dns server must be router's gateway, as far I know.

Add system and internet connection uptime please, and also see these pictures

@Kevin_Z I meant this one

Why they aren't allowing user to using other ports for SMTP server!?

Why there is no up time information in this router? Previously I've installed beta firmware provided by them it somehow showed up time but it was bugged.