A custom network is a network that you create by using the virtual network editor. You can select a custom network when you modify the network connection setting for a local virtual machine. For a remote virtual machine, you must select a custom network. You cannot select a custom network for a shared virtual machine.
A custom network can be connected to one or more external networks, or it can run entirely on the host system. You can use the virtual network editor to access multiple network cards in the host system and create multiple virtual networks.
For more information, see Using the Virtual Network Editor.