DNS hairpin only works on the primary Eero, all other Eeros on same network fail

I am trying to access some internal sites on my network with their external DNS name, all ports are correctly open and sites are perfectly accessible from outside the network.

Strangely, if my browsing device is connected to the primary Eero that has the internet connection, DNS resolution works as expected.

But, if my browsing device is connected to any other Eero in the network, DNS resolution fails for the internal site on its external DNS name.

Restarting the Eero network or individual Eero devices does not resolve the issue I.e. it is not intermittent and is reproducible every time.

No Eero Secure or Eero Labs features are enabled.

Hope this makes sense.



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