tunnelkit VS passepartout-app

On some devices, when your iPhone or iPad goes to sleep, it causes ProtonVPN to stop working. This will typically cause the device to disconnect from your WiFi network. We have identified that the problem lies with iOS and is outside of our control. Thus, unfortunately, we cannot fix it at this time. This bug also affects other VPN clients and providers, as shown in this issue opened on GitHub on Dec. 1, 2019. You can fix this error by restoring your iPhone or iPad to its factory settings and reinstalling the ProtonVPN app. This will remove all data from your device. We only advise that users who have a high threat model consider taking this step. More details here.

Sounds familiar? https://github.com/passepartoutvpn/tunnelkit/issues/193

I've been looking for the past days for a solution to get NextDNS and ProtonVPN seamlessly working together on my iPhone and found several workarounds, but none of them worked or worked stable enough. I prefer the advantages of NextDNS over Netshield. Then I remembered I purchased Passepartout quite a while ago (available in the App Store, also for iPad and Mac) and since it's a very user-friendly, flexible OpenVPN Client I expected it to have a possibility to enter custom DNS server, so I would be able to use NextDNS for parental controls et cetera instead of ProtonVPN DNS servers. I started fiddling, but to no avail, unfortunately I still had no DNS-resolution. I mailed the developer of Passepartout and got a reply within the hour pointing me to Github, to this closed issue: https://github.com/passepartoutvpn/passepartout-apple/issues/171#issuecomment-786809247. It works flawlessly and as I already had ProtonVPN configured, I only had to add an NexDNS ip address to the config, and reconnected and my problem was solved!