Dealing with duplicate MAC addresses and Hyper-V

Posted by joel on December 2, 2009

After building up four Hyper-V servers running Server 2008 R2, I ran into a head pounder yesterday. After taking a sysprep’d image of Server2008 and getting it all setup I would get inconsistent network connectivity. I rebuilt the network stack, blew away the virtual card, confirmed it wasn’t the Hyper-V server itself, yada yada yada. I ended up finding this [post] about duplicate MAC addresses over at virtualizationadmin.com. After reviewing the document, I went through and inspected all the MAC addresses across four Hyper-V servers and found the duplicate!

My solution was also near the bottom of the document whereby I assigned a static MAC address from within SCVMM. Worked like a charm.

Joel out.