How do you block the DNS of a device

[vandriver]

How do you block the dns of a single device?

Putting this in asus wireless as all my units are ac86u's?

6 x ac86us, 1 main 5 ap's, all running merlin, everything on the network cat7/8 cable where possible, iot devices on guest network, channels okay, settings on routers i think are okay, have spent years reading this forum for answers and tried and tested what worked for my own environment.

how do you block the dns of a single device? I cant find the answer anywhere. I dont know if im using the wrong search terms or what.

I have over a hundred tuya devices running through home assistant and over time have transferred them onto tuya local to try and stop disconnections and find some stability.

Now I need to block incoming, outgoing and dns connections for each device.

I've just installed Skynet and blocked the ip's of the devices but how on earth do block the dns? The devices will sit in a zombie state if I only block incoming and outgoing, apparently i need to block the dns too?

I would be very great full if someone could point me in the right direction. Thanks

 

[Justinh]

Could you use Firewall > Network Services Filter? Point the LAN IP to a black hole?

 

[vaboro]

I've just installed Skynet and blocked the ip's of the devices

Did I understand you correctly that you blocked LAN IP's of IoT devices?

The devices will sit in a zombie state if I only block incoming and outgoing, apparently i need to block the dns too?

Do you mean that blocking LAN traffic of IoT devices sends them to "zombie" state?
I personally use AdGuardHome to block DNS traffic of certain LAN clients. The regex /^.*/ does the whole job:

Spoiler: AdGuardHome custom filtering rules

AdGuardHome is used to resolve all DNS traffic on LAN and for DNS caching. Query Log is very nice.