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:

Manual /etc/resolv.conf Configuration