I set my PiHole as DHCP using Cloudflare as upstream for DNS lookup. However according to dnsleaktest.com I am leaking DNS requests to my ISP server (see pic). Strangely, this occurs only in Windows (tested on several devices). Doing the same test on my Android smartphone results in only Cloudflare server used. If I set manually as DNS server PiHole's local ipv6 address to all my Windows machines issue doesn't occur. What I'm missing?
First bet is that your router is still sending RAs to your Windows machine containing the ISP IPv6 addresses.
How did you configure your router? Is it still the DHCP server or are you using the Pi-hole DHCP server?
No, I disabled DHCP on my router before setting DHCP on PiHole
Did you renew the DHCP leases on all clients, along with rebooting the router?
Yes, router leases list is empty and issue occurs also with devices that weren't never connected using router's DHCP.
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