Create a Network
Go to the Applications :: Virtual Machines page
Click Network (displays dialog)
Click Create virtual network (displays dialog)

Enter Name
On Forward mode drop-down, select NAT
On Device drop-down, select one
On IP configuration drop-down
IPv4 onlyselection
Enter IPv4 address.
Enter Mask or prefix length.
Select DHCP range checkbox, enter Start and End values.
IPv6 only selection
Enter Prefix length.
DHCP range checkbox, enter Start and End values.
IPv4 and IPv6 selection
Enter IPv4 address.
Enter Mask or prefix length.
DHCP range checkbox, enter Start and End values
Enter IPv6 address
Enter Prefix length.
DHCP range checkbox, enter Start and End value
Click Create.