I am stuck in a weird problem. I know of the MAC address and i want to know its IP address. I know the very common way--ping all devices in the local subnet and read the ARP cache using arp -a but this is restricted to the local subnet only. Even if I am able to ping the device outside my subnet, i cant see its entry in the ARP cache. I am looking for a solid way here. I have seen many products in the market which discover networks and can tell the IP Address of the machine connected to each port on the switch. I know the MAC address of whats connected at a specific port but dont know how to retrieve the IP address of it. using RARP is ruled out because it needs the RARP server on the network which is not present. I thought DHCP might help and tried DHCPInform but this type of packet is ignored by the DHCP server on Win NT4 because it doesnot know how to process it ( As written in microsofts documentation in MSDN). I dont know if there is some other option in DHCP which might help. I have to implement the procedure in my software, so please suggest the ways which can be automated. 
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Come on Experts!! Someone must be knowing the solution...on this planet atleast !!!
Somehow I mess up my onboard 82759v mac address on my x79 sabertooth when flashing, and found this tool which can manually change the onboard intel lan mac address to fix it.
