Ubuntu /centos virtual machine doesn't have IP address/ can't connect to network?

you may turn on the NAT/Bridget/HOST ONly setting for your GUEST OS, but when you run the ifoncfig, there is no IP v4 address associated.

Basically, make sure on the HOST machine, the vmware/virtualbox DHCP service are running,

then run dhclient eth0, you should be able to get a IPv4 address.

for the windows host machine, the dhcp range are stored in the registry. so make sure the VMnet NIC ip address match the network address, otherwise, from the host machine, you can’t ping or access the guest OS.