When I create a macOS vm (haven't tried a linux vm) the network connection in the guest is to a 192.168.64.* network, which is apparently a kind of NAT on my host, because it's not the ip range of my LAN. Within the guest, the DNS server is set to 192.168.64.1 which I believe refers to the host, however it doesn't seem to actually work, ie lume doesn't seem to be running a dns server or forwarding the dns requests properly, as I don't have working DNS in the guest until I change the DNS to a working ip like 1.1.1.1 or my LAN's dns server.