pihole-dns-troubleshoot-ipv6

Systematic diagnosis and resolution of IPv6 DNS issues that cause clients to bypass local network access and connect via Cloudflare Tunnel with OAuth authentication.

Cloudflare DNS has both IPv4 and IPv6 records for tunnel hostnames:

When clients query for .temet.ai, they receive both addresses. Modern clients prefer IPv6 → connect to Cloudflare → require OAuth authentication instead of using local network.

Diagnoses and fixes IPv6 DNS issues causing clients to connect to Cloudflare OAuth instead of using local network access. Use when services show OAuth login prompt on local WiFi, slow initial connection followed by authentication, or Chrome shows "error with retry". Triggers on "connecting to Cloudflare instead of local", "OAuth prompt on WiFi", "IPv6 DNS issue", "clients prefer IPv6", "disable IPv6 DNS", or "fix local access". Works with Pi-hole FTLCONF_misc_dnsmasq_lines filter-AAAA configuration and client DNS cache management. Source: dawiddutoit/custom-claude.