Unicast Mode Network Load Balancing on Hyper-V

This Microsoft blog post discusses a problem you might encounter when you enable NLB in unicast mode on Hyper-V virtual machines.  Clients may not be able to access the virtual IP address of the NLB cluster or the VM’s themselves.  This is because MAC spoofing is disabled by default on W2008 R2.  The blog post shows you what change to make to each VM in the NLB cluster to resolve the issue.

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