If you want to create an NLB on Windows 2008 R2 Hyper-V, you will notice that all previous blog posts around this topic will do you no good.. Although you can setup the NLB, network traffic will halt no matter what you do.. change the mac to static, revert it back etc etc.. seems Hyper-V version 2.0 actually has a more neat way of allowing NLB traffic coming from clusters without setting static mac addresses..

Here’s how to get it working:
Create your VM and give your VM legacy network adapters (for 2003 at least) select the Dynamic Mac address but do select the Enable spoofing of MAC addresses option. Now create your NLB as you did before.. note that you do this on all network adapters that are in the or some sort of NLB. The intra-array traffic does not need this option.

Happy NLB’ing

PS; if you decide to use synthetic adapters you will receive the error: 8004100a00000000 meaning the NIC drivers are not NLB compatible..