Default Security Policy for Distributed Switch distributed port groups

Setup
VMware vCenter 5.1
ESXi 5.1 GA build (799733)
Issue/Observation
We observed that one of our NIC card was not showing connected when we tried to Power ON a VM. Upon investigation we found that VM changed the Mac Address and because the default setting for the security policy have changed for distributed virtual switch in vSphere 5.1 from Accept to Reject
Default Setting
vSphere v5.0 and earlier
vSphere v5.1 and later
Promiscuous Mode
Reject
Reject
MAC Address Changes
Accept
Reject
Forged Transmit
Accept
Reject

 KB Article

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