R1D2 wrote Only DNS, HTTP and known ports for services can be blocked technically. If your children are clever, they can circumvent ANY blocking. Even other competitor's gear can NOT do better....

I have bought Archer C59 (hw v1, sw 1.0.2). It has same problem too. Parental Controls completely DOES NOT WORK. It seems only block DNS lookup and http traffic! But children can use torrent download...