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2

The first icmp packet is fail because host sends ARP request. If the destination host MAC is already in ARP cahce the device is not send this request.


2

Connect to the device via a crossover cable or on the same network segment (preferred) via a switch/hub and run a network sniffer (netmon/wireshark/tcpdump) in promiscuous mode to identify the MAC address of the black box.


0

If you can connect physically to the device, or at least to the same network segment, you might be able to use arp -a to show you the mac address table on your server.


0

Can you download Linux live CD, plug it into your Macintosh, and use dhcpd in Linux to get the MAC address? (sorry, would have put this in a comment after the previous comment, but I don't have enough reputation on this site yet... :)



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