Custom Local DNS with Ubuntu Clients

[Tom H]

On Sun, Mar 11, 2018 at 11:53 AM, Aero Maxx <aero.maxx.d at gmail.com> wrote:
>
> I have a single linux desktop client running Ubuntu, and have 2
> physical servers that are on my network that providing DNS resolution.
>
> I want the linux desktop to use the local servers for DNS resolution
> only, but Ubuntu somehow keeps finding the DNS server that is in the
> router/modem that my ISP has provided me with.
>
> Is there a way I can stop the IP address of my router from being added
> to the /etc/resolv.conf file?
>
> I tried removing the resolvconf package, but this broke things as for
> some reason I wasn't able to then create my own resolv.conf file.
>
> Thanks for any help you are able to give me.

What is the app that's managing the network? NM? ifupdown? systemd-networkd?

Is resolvconf or systemd-resolved involved in setting up "/etc/resolv.conf"?

What's the output of "ls -l /etc/resolv.conf" and "cat /etc/resolv.conf"?