Hyper-V: More than one network adapter should be available

Applies To: Windows Server 2008 R2, Windows Server 2012

This topic is intended to address a specific issue identified by a Best Practices Analyzer scan. You should apply the information in this topic only to computers that have had the Hyper-V Best Practices Analyzer run against them and are experiencing the issue addressed by this topic. For more information about best practices and scans, see Best Practices Analyzer.

Operating System

Windows Server 2012 or Windows Server 2008 R2








This server is configured with one network adapter, which must be shared by the management operating system and all virtual machines that require access to a physical network.


Networking performance may be degraded in the management operating system.


Add more network adapters to this computer. To reserve one network adapter for exclusive use by the management operating system, do not configure it for use with an external virtual network.

For information about adding a network adapter to the computer, consult the documentation for the computer or the network adapter. After you add a network adapter, avoid associating it with an external virtual network to reserve it exclusively for the management operating system.