I don't know, what's more I don't know how to check.Which ever most likely?
ISP plastic box didn't allow custom DNS, I disabled DHCP and IPv6. On pihole I enabled DHCP with IPv6 disabled.
I know, I know enough to be dangerous now, and I'm trying to get the system through my dangerous phase. I don't think I know enough to ask intelligent questions yet...
Both pi's have static IPs.
I asked the *arrs to talk to each other, and when they didn't work (and only when they didnt work) I "ufw allow"ed the relevant port.
I just want to patch up my firewall layer as best I can, and then start building security layers on top/below it as I learn how.
So I told Sonarr that qBit it at 192.168...:port. The test failed, "ufw allow port", then the test passed. Could I instead have told Sonarr qBit is at 172.18...:port(dockers network address) and then close up the firewall. Or can I set them all to "ufw limit". Or set the firewall to only allow local local traffic... You get the idea, I know enough to be dangerous but not enough to ask the right questions.