Create a NAT Network

1. Lanch the VirtualBox program.
2. Choose from menu: "File" → "Preferences...".
   
   
3. In "Preferences", choose "Network" and click button on the right.
   
   

Modify the NatNet Details

1. Choose the "Edit selected Nat Network" button (i.e., the button in the red box below).
   
2. Fill out the details as shown in the above picture.
   • Network CIDR: 192.168.172.0/24