Pi-hole is dropping request from a different IPv6 subnet

Hello,

I have a home network with 2 IPv6 subnet (/64 each). Pi-hole is on one subnet (aaaa:bbbb:cc00::/64). I have some equipment on the second subnet (aaaa:bbbb:cc:07::/64). Equipment on both networks can communicate: I can ping between different network and connect as SSH.

Equipment on both networks have the pi-hole address given as their DNS server (IPv6)

Expected Behaviour:

All equipment should be able to resolve DNS queries.

Actual Behaviour:

Only equipment on the same subnet as pi-hole get replies. On the other subnet, no answer is received.

When debugging with tcpdump, I can clearly see the query packets arriving on the pi-hole ethernet interface. But they are ignored by pi-hole: no answer nor traces in the logs.

Is there an option which prevent pi-hole to answer queries from a different IPv6 subnet?

Thank you.

Try below setting on the DNS tab:

image

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It worked!

Thanks a lot.

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