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.
does this still hold true? i have the most up to date defs but mvm still cannot find the MAC address of any of my *nix machines.
Yes this still holds true.