Split Domain Config possible

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1

Hi Guys
Is this generally possible with pihole?

External-Domain: sunny.com
Internal-Domain: rainy.com

  • External Service: e.g. Mail-Sevice (mail.sunny.com points to their MailServer)
  • Internal Service: e.g. File-Server (file.sunny.com points to my router where ports are NATed to target)

(A) Internal / External Clients:
Hey Pihole I want to setup my mail Programm could you tell me the IP of mail.sunny.com?

  • sure no problem champ, here you are x.x.x.x (external ip of mail server)

(B) External Client:
Hey external DNS-Server I want to copy a file to file.sunny.com could you tell me the IP?

  • sure no problem champ, here you are x.x.x.x (external ip of router)

(C) Internal Client:
Hey Pihole I want to copy a file to file.sunny.com could you tell me the IP?

  • sure no problem champ, here you are x.x.x.x (internal ip the Fileserver)

At the moment A and B work and while C also works, they ask the external DNS and are then routed back through the router. I would like Internal Clients to know the internal IP of the fileserver so that they can communicate with the fileserver without going over the router....

I have done this already with "company"-grade gear and I remember having to maintain external and internal records for everyhing i wanted to reach from outside and for everything I wanted to reach from inside.

It would be cool to say hey Pihole: if internal Clients look for file.sunny.com give them the internal ip of the file-server and for all other queries to *.sunny.com send them outside.
That would be awesome. If not possible, I would also be okay with having to maintain internal and external records for domain sunny.com

But at the moment I dont even know if pihole knows sunny.com or rainy.com

Mike

2

Local resolution of fully qualified names takes precedence over forwards to upstream DNS.
You can supply any desired hostname to IP mapping via /etc/hosts on your Pi-hole machine, see also existing answers/remarks, e.g. in Can I use Pi-Hole DNS as a online hosts manager? as well as Set own DNS enteries via web interface - #2 by Bucking_Horn

3

Thanks m8

One more question:

As soon as I add "file.sunny.com" to the etc/hosts file will also have to add mail.sunny.com in the file as well?

Or will it relay queries that it can't handle outside?

4

Your entries in /etc/hosts will be matched exactly, so if you would redirect google.com, www.google.com would still resolve fine, or in your case, if you just add file.sunny.com, a DNS query for mail.sunny.com will still be forwarded upstream.

Don't forget to restart Pi-hole's DNS server after editing (takes a few seconds):
pihole restartdns

5

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