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DS requests sent to Cloudflare for internal TLD

br flag

I created a Bind9 configuration to provide DNS entries for an internal TLD. Bind9 uses Cloudflare as forwarder:

options {
        directory "/var/cache/bind";
        dnssec-validation auto; 
        validate-except { "mytld"; }; 
        forwarders { 1.1.1.1; }; 
        listen-on { 127.0.0.1; 192.168.78.0/24; }; 
}

and (almost) everything works as expected. But every request for my TLD causes DS requests to Cloudflare:

16:28:34.165569 IP myserver.49728 > one.one.one.one.domain: 45669+% [1au] DS? mytld. (46) 
16:28:34.179688 IP one.one.one.one.domain > myserver.49728: 45669 NXDomain* 0/6/1 (1026)

validate-except obviously does not keep the local Bind9 from forwarding a DS request – is there another way to keep DNS traffic for .mytld entirely local?

Thanks, Jan

mangohost

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