Could you explain how this is supposed to work? I now have an Ubuntu VM with a single network interface, to which I assigned a bridge (without IP address and without physical interface). I try to ping the host from inside the VM but this isn't working. When I type ifconfig in Ubuntu then it shows network interface ens3 doesn't have an IP address.I also have another bridge (br1) without any physical interfaces and no IP address as a "host only" virtual switch.
Ultimately I'm looking for a way to mount an NFS share from the TrueNAS host inside the VM, and restrict it in such a way that it can only be mounted from the guest and not from any clients in my LAN (not even if one of them would have the same MAC and IP address as the VM guest).