In order to
communicate between the VM's and also to connect to an internet, please follow the below steps
1) Select Settings->network->
Attached to :Internal network from virtual Box GUI
2) Once VM boots up, we need to configure static IP's for an interface to communicate between the VM's.
You need to stop networking service in VM's from resetting an interface.
3) Suppose if you want to connect to an internet you need to configure NAT network
File->preferences->Network and add NAT networks
