@BennyNissen 1. remove all manual routing. you should not route anything

@FokkoBrugge yes, you need to install java 17 sudo apt install openjdk-17-jdk-headless To manage the active version, don't forget about the update-alternatives command: sudo update-alternatives...

@FokkoBrugge https://static.tp-link.com/upload/software/2025/202503/20250331/Omada_SDN_Controller_v5.15.20.18_linux_x64.deb

@MarcIES then you can choose from these routers, but none of them have poe https://www.omadanetworks.com/en/business-networking/omada-router-wired-router/

@MarcIES have you seen if you can get the purchase v2, it has up to 12 units

@GRL yes I did it two days ago, moved from windows to a raspberry pi, took a backup of the old one and restored it to the new one and everything was up and running in a few minutes