Create a NAT Network
- Choose from menu: "File" → "Toos" → "Network Manager".
- Click on the "NAT Networks" tab and click on "Create" button.

Modify the NatNet Details
Click on "Properties" button and fill out the details as shown in the picture
below:
- Name: NatNetwork
- IPv4Prefix: 192.168.172.0/24

Go back to the VM setup page.