Kept banging my head against this VMware Fusion 4.0 error message on trying to bring up a Simulate ONTAP™ vsim: Network bridge on device VMnet0 is not running
I kept on thinking it was my network config.
It was much simpler than I realized, I was running a VPN and once I turned that off, my devices started working!
hope this solution will also work :
http://rizwanranjha.blogspot.com/2013/07/the-network-bridge-on-device-vmnet0-is.html