Hi all. I currently have got a host with one container. The container runs an instance of PiHole, which is my LAN DNS server. I am now attempting to add another container (nextcloud) but DNS does not work properly. I can see the DNS request in my PiHole log but the response does not seem to make …

You’re running into a hairpin/NAT-reflection edge case: Nextcloud → host IP:53 → Pi-hole (container) → (reply) often breaks for UDP when the service is on the same host. That’s why pointing to 172.17.0.2 works. Fixes: Enable Docker’s userland proxy (helps container→hostIP→container flows, especia…

DNS response fails partway

General

mondq (Mondq) October 20, 2025, 7:49pm 3

Thank you for the insights. I used network_mode: host and everything works now.

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DNS response fails partway

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