Wednesday, April 15, 2020

Ubuntu DNS Stub Listener #Disable

During setting up PiHole, it requires to listen on DNS (53/TCP, 53/UDP) on the host. Ubuntu version that I am running on (20.04) by default listens on port 53 because it runs as DNS Stub Listener.

PiHole will give errors about Binding error

To disable Ubuntu running as DNS Stub Listener, do the followings:

> sudo vi /etc/systemd/resolved.conf 

un-comment #DNSStubListener=yes 
change it to DNSStubListener=no

> sudo service systemd-resolved restart
> sudo systemctl disable systemd-resolved.service
> sudo systemctl stop systemd-resolved
> sudo mv /etc/resolv.conf /etc/resolv.conf.old
> sudo shutdown -h now -r

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