First of all thank you for your inputs.
I changed the Port tagging setting in my unifi switch.
Was previously set to "Allow all VLANs", now I reduced the allowed VLANs to the few needed and excluded the untagged LAN from this port.
My LXC now get 1 public IP only (from the desired VLAN prefix).
I changed the Port tagging setting in my unifi switch.
Was previously set to "Allow all VLANs", now I reduced the allowed VLANs to the few needed and excluded the untagged LAN from this port.
My LXC now get 1 public IP only (from the desired VLAN prefix).