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I have a bit weird setup with powerdns:

  • For our company domain xxx.de, we have four NS entries in the public internet (at Nexinto). We run a hidden primary (called dns-ext) using Powerdns/Poweradmin, this works so far so good.
  • Inside our Windows AD based network, we use the Windows-internal DNS server (called ad-master; our company domain is NOT the AD domain name to avoid confusions!)
  • We have another server (called dns-int) inside the LAN that has Powerdns/Poweradmin, which serves the internal view of xxx.de; the AD server is configured to forward queries of company machines to this server
  • dns-int runs pdns-recursor at UDP53, and pdns (the authoritative part) at UDP/54; recursor is configured to forward queries to xxx.de to localhost:54
  • due to network security restrictions, dns-int can not directly connect to the Internet and "upstream" DNS requests must go through a dns proxy server

The problem is that right now when I want subdomains I have to create them both in dns-int and dns-ext, even if I do not want a split-view for this subdomain zone.

So I thought "okay, set in dns-int a.xxx.de NS a.prim-ns.de, place a forward entry for .=ip_of_proxy and it should work", which it did not because when asked for b.a.xxx.de dns-int could not ask at a.prim-ns.de - Powerdns tried to connect to a.prim-ns.de regardless of the . forward. CNAME'd records to public Internet addresses fail for the same reason - dns-int tries to resolve the CNAME which fails and returns just the CNAME record to ad-master, and ad-master does not want to resolve that CNAME entry for some reason.

There is no way to get outbound access for dns-int - so how can I make powerdns use the DNS proxy for all queries it cannot answer?

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