We are trying to keep our supervised student iPads connected to our FortiGate DNS server at all times, when they are at school, it's done easily as you can expect. But when they go home, we have no way to set their DNS servers towards our publicly available firewall DNS server.
Main goal here is to use our firewall as a web content filter when they are at home too, how is the mainstream method of doing this? I hear plenty of people use "Securly" but I'd like to consider our free options if they are available at all. Thank you,