I don't want to use my ISP's DNS servers, but I'm a little confused as there seems to be multiple places to configure alternate servers. Using the LuCI interface, I can go to the WAN and WAN6 interfaces, under Advanced Settings, and clear the "Use DNS servers advertised by peer" checkbox. But then …

How to configure custom DNS servers

anon57995562 March 20, 2018, 8:09pm 12

Try adding the following to your .opvpn file...

block-outside-dns

Open VPN and NordVPN