On Sat, Feb 09, 2019 at 10:15:21PM -0500, Rami Al-Dalky wrote:
> I have a question. Is there any cases where the recursor will send a DNS
> query with loopback IP in the client-subnet?

Yes.

https://doc.powerdns.com/recursor/settings.html?highlight=ecs#ecs-scope-zero-address
explains this behaviour. The preceeding settings are also relevant to read.

I admit this is confusing, but it is what the RFC requires.

        Bert
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