DNS issues between interfaces

[Usr0815]

I am new to OPNsense, I just set it up today.
Maybe someone can help me, here is the issue:
I have my standard LAN interface (192.168.50.1), under which I have a pihole running (192.168.50.10).
I wanted to use the third port (opt1) on the server OPNsense is running on as a dedicated port for all things connected to Jellyfin. I have this connected to a port on my second server, which all the containers are using, so I set it up as a seperate interface (192.168.30.1). Somehow when I enter my piholes ip address as the dns server, the containers are not able to establish an internet connection, but when I set it to the cloudflare dns, everything works. How do I fix this? All my devices on the LAN interface also use the pihole and they are running fine.
For setting up the network, I just set up two firewall rules, identical to the ones automatically created for LAN. (except for the source of course).

Maybe someone with a bit more experience can tell me what is going on.
Thanks!

[Saarbremer]

Hi,

you could start debugging this situation with Firewall's Live View. You'd probably see many UDP towards port 53 packets being rejected (my guess). If these are blocked with "default deny / state violation" you may try the following:

Generate a TCP/UDP allow rule on OPT1 towards your PiHole's IP on port 53. I would also recommend writing this IP as alias for less maintenance in the future. Any other more general rule matching this requirement will also work.