Guidelines for Configuring a Virtual Network

You must create a private virtual network even if the virtualization server they reside on is not connected to any network,
All Virtual machines connecting in the same virtualization server should be connected to the same private virtual network.
If you need to connect a virtual machine to a physical network, connect it to a virtual network that is configured to an external network adapter.
When you need virtual machine on a virtualization server to connect to virtual machines on another virtualization server, you must create an external network.
If you want to attach multiple virtual networks to a single physical network adapter and would keep the networks completely isolated from each other, you should use unique VLAN IDs,.
When complete segregation of networks is not necessary, you can configure multiple subnets on the same virtual network to be connected to the same physical network adapter. In this case, two virtual machines on the same network with different IP subnets would not interact with each other.
You must use a legacy network adapter if you need to perform a network-based installation of the guest operating system or when integration services are not installed in the guest operating system.
A regular virtual network adapter would work only if the virtual machine driver is installed. On all supported operating systems, you must install integration services in the guest operating system to install the virtual machine driver.
A legacy network adapter can work without installing the virtual machine driver. Note that communications through a legacy network adapter are slower than through a virtual network adapter.
If you connect a virtual network to a physical network adapter that uses a static IP address, the new connection will overwrite the current static settings.
You cannot connect a virtual network to a wireless network adapter. Therefore, you cannot provide wireless networking capabilities to virtual machines.

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