Diagnosing a cause of PXE boot failure

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The other day I was trying to boot a virtual machine over the network using my Windows Deployment Services (WDS) Server.  This normally works fine – but for some reason I was getting nothing but errors.  Sometimes I would get a DHCP failure, other times I received varied PXE error messages:

PXEFail

After some investigation I stumbled on to the problem.  There was a MAC address conflict.  While Hyper-V will not let MAC address conflicts happen on a single server – but you can still have conflicts happen between multiple Hyper-V servers.  John Howard has talked about this extensively here: https://blogs.technet.com/b/jhoward/archive/2008/07/15/hyper-v-mac-address-allocation-and-apparent-network-issues-mac-collisions-can-cause.aspx

Once I realized what was happening – I quickly changed the virtual machine to use a static MAC address and set the MAC address to a unique value:

image

Then network installation worked fine.

Cheers,
Ben