PiHole is beeing ignored

[Bauanga]

Hi everyone,

I'm encountering an issue with my OPNsense firewall setup involving Pihole as my DNS server. Here's the situation:

- I use Pihole as my DNS server and have configured it in the DHCP settings of OPNsense so that clients receive the Pihole address.
- In Pihole, I've set OPNsense (with unbound enabled) as the upstream DNS server.
- Everything worked perfectly until now.

I've recently reinstalled my OPNsense firewall (because, apparently, I have nothing better to do than play IT admin), and now, even with the exact same setup, things aren't working as expected. The Pihole address is still being handed out via DHCP, and in the pihole GUI iI see queries comming in. However, Pihole seems to be completely ignored—if I even shut down Pihole, all DNS queries are still being answered. From who? DNS Server from the client is set to the pihole ip adress.

Does anyone have any idea where the issue might lie? I'm completely stuck here and would really appreciate any help or pointers.

Thanks in advance!

[EricPerl]

nslookup [-opt ...] host server # just look up 'host' using 'server'

Omit server and it will be using the host's default DNS server.
Use it to verify that your host is doing what you expect it to be doing.

For example, I'd expect 'nslookup opnsense.org pihole_ip' to timeout when pihole is shut down.