A lot of people have asked about setting up NLB clusters on virtual machines. This is possible. But, there a few things to keep in mind.
If you’re trying to create NLB clusters using Virtual Server Virtual Machines, before designing your solution familiarize yourself with the supported configurations. Refer to
http://support.microsoft.com/kb/925476 for details on which configurations are supported.
Apply the fix in the KB article to each of the Windows Server 2008 VM guests that are cluster nodes. Note that this fix will be included in Windows Server 2008 SP2.
NLB changes the MAC address of the machine when you bind NLB on a node, change the operation mode of the cluster, change the primary IP of the cluster, or unbind NLB from the node. Hyper-V in Windows Server 2008 requires a reboot of the VM if its MAC address is changed. The KB article describes the process to follow to create a new cluster or add nodes to a cluster using Hyper-V VMs.
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