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
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Default Setting
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vSphere v5.0 and earlier
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vSphere v5.1 and later
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Promiscuous Mode
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Reject
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Reject
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MAC Address Changes
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Accept
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Reject
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Forged Transmit
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Accept
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Reject
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KB Article
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