i have migrated vms form one of my esxi 4.1 to another esxi 4.1 under cluster there on vc 5.1
then upgraded one host to 5.1-it was successful,host is reachable in network
but when i migrated[vmotion] vms back to esxi 5.1,am unable to ping any of vms on esxi 5.1
even tried form esxi 5.1 console as well-unable to ping vms,while network given on vms is reachable form host
Please advice if anything else i have do before moving back vms to esxi 5.1 ?
and will it includes major downtime for my prod vms?