Should OpenVPN client use VPN DNS by default?

I use OpenVPN as client and without manually changing DNS to VPN’s one it doesn’t work. If I leave it as “Automatic” it correctly show my OpenVPN DNS server, but now working anyway. It’s me or just firmware?

To confirm, is your OpenVPN DNS server at IP That is a private IP address (maybe your router’s IP?).

I do not work for and I am not directly associated with GL.iNet

No, this is DNS server hosted at my own VPS with OpenVPN. I solved the problem by setting up native OpenVPN connection and interface at Luci and by using this script: [OpenWrt Wiki] OpenVPN extras

Works perfectly.

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It should be bug.

If it is automatic it should use vpn dns when connected.