Cannot enable iSCSI port binding without adding a physical NIC to the vSwitch

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http://serverfault.com – Why can I not have a purely virtualized SAN in vSphere 5? I cannot enable the iSCSI port binding option (it is greyed out and unchecked) or add the VMkernel to the iSCSI software host bus adapter unless there is a physical NIC associated with the vSwitch. (HowTos)