I have 2 security questions: 1. How do I disable IPv6 utilization completely through OpenVPN Android Client for both Mobile Data and Wi-Fi? AdGuard has an option for that in Low Level Settings. I tested that AdGuard option and it worked as described by disabling IPv6 for both WiFi and Mobile Data. How do I do the same with OpenVPN Android Client? I only see IPv6 Tunnel Preferences option in Android OpenVPN Client. Should I set that option to IPv4-Only Tunnel to disable IPv6 for both Mobile Data and Wi-Fi when using OpenVPN? 2. How do I set custom DNS in OpenVPN Android Client?