Enable Private DNS with 1.1.1.1 on Android 9 Pie

What this post added

This post details the integration of Cloudflare's 1.1.1.1 DNS resolver with Android 9 Pie's new Private DNS mode, which supports DNS over TLS (DoT). It provides step-by-step instructions for enabling DoT on Android devices and explains the privacy benefits of encrypted DNS queries. The post also discusses the challenges and solutions related to DNS in an IPv6-only network environment, including the requirement for hostnames in Private DNS and the mechanisms like DNS64 and NAT64 for IPv4/IPv6 coexistence.