I've performed a discovery scan with Founds 6.5, to get an inventory of all Mac OS devices within the enterprise. After reviewing the scan report, I noticed in the Banner column of the report that the MAC address for the devices equals null. The MAC address shows proper for PCs. Any ideas on this?
MVM can only discover the MAC address of Windows based systems. We do this by doing a banner grab on TCP port 137, which is the Windows netbios port.
Since ARP requests will not pass through a router unless configured to do so this is the only reliable method.