How to force DNS servers in Ubuntu?
I periodically have issues with the DNS setup on my Ubuntu desktop. I
finally decided to address this issue by forcing the DNS resolution to
go through DNS servers I specify, rather than using the default of
systemd-resolved
. To do this, here are the steps:
$ sudo systemctl stop systemd-resolved.service
$ sudo systemctl disable systemd-resolved.service
$ sudo rm /etc/resolv.conf # remove symlink
$ sudo -e /etc/resolv.conf # see (1)
$ sudo -e /etc/NetworkManager/NetworkManager.conf # see (2)
About (1), edit your resolv.conf file and set the DNS servers you want, for example:
# Control D
nameserver 76.76.2.0
nameserver 76.76.10.0
The final step (2) is to prevent NetworkManager from overwriting your
resolv.conf file. In order to do that, add the following under the
[main]
section:
dns=none
rc-manager=unmanaged
Reboot the computer and that should be it (and permanent).