NetworkManager Configuration
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Internal
/etc/NetworkManager/NetworkManager.conf
man NetworkManager.conf
/etc/resolv.conf Processing Mode
By default, NetworkManager will update /etc/resolv.conf to reflect the name servers provided by currently active connections.
This behavior can be changed by setting of the "dns" and "rc-manager" element.
In order to configure NetworkManager not to touch /etc/resolv.conf, shut down the NetworkManager and then set the following in the "[main]" section of /etc/NetworkManager/NetworkManager.conf:
[main] ... dns=none rc-manager=unmanaged
Once this is done, /etc/resolv.conf can be maintained manually as described here: