From what I understand Scale uses libvirtd and KVM virtualization. You’re probably using the builtin virtio virtual network, which uses macvlan if I recall correctly. Anyway, because of the way it’s set up, communication between the VMs and the host is impossible. I’m guessing that what you need to do is create a bridge on the host, and then assign it directly to each of the VMs. That’s how it works with regular KVM anyway. If TrueNAS are doing something different that might throw a wrench.