OpenMediaVault in dietpi Rp4

Hi, I have installed OMV on my rp4 running on dietpi. I have an issue concerning ethernet connection. For i while it worked correctly but not anymore. I have tried all and i think every possiblity in setting up ethernet connection using the dietpi-config and OMV network connection part. In the router i have assinged and address to my rp4. What do i miss?
Thank you

How did you install it?
OMV uses systemd-networkd to manage the network, but DietPi uses ifupdown. SO my guess is, it just works until the next reboot and from there on you network config is screwed.

This is exactly the case. After reboot things get messed up. What is the workaround?

before reboot make sure systemd-networkd is installed/configured?

The problem is, our network config conflicts with the one OMV uses. Because of this there is no more official support of OMV from Dietpi, you would need to config systemd-networkd by yourself. WarHawk posted a tutorial you can follow.