So, to add to my previous Linux Perils:
I adventured into VLANs. I have now a complete Unifi Setup and segregated my IoT devices, my Voice devices (Google Home, Alexa), my general internet and management network.
However, this brought me some new issues, as Hassio was not able to listen on the Multicast L2 that is required for a lot of component. i.e. the Xiaomi Air Purifier was simply not possible to connect. It even flooded my Network so that the Hue integration stopped working completely.
After reading a lot, i finally found the solution is simply adding the VLANs to my HASSIO. All on the same Ethernet Port.
There were basically 2 posts that helped a lot:
and
I just adjusted the whole thing a little bit. So basically it works like this for me:
Step 1: Add "networkmanager" to the packages in the SSH & Web Terminal Addon from the Community Repo.
Step 2: Turn off Protection Mode so you can edit the base system
Step 3: Check the connections by typing: nmcli connection show
Step 4: Create a new VLAN (you can choose the name) under the device that is your ethernet. For me this is enp2s0. nmcli con add type vlan con-name enp2s0@vlan10 dev eth0 id 10
Because i do not define the IP, the Gateway or the DNS i am using my DHCP Server for it.
Step 5: Recreate for any other VLAN. id = vlan id.
Step 6: After restart all of the previously not found devices are finally back. Even the WOL works like a charm.