1. ping the broadcast address
2. arp -an | grep "MAC addr"

Of course the Microsoft TCP/IP chose not to respond to broadcast pings so hope it's not a MS OS on the box.

-----Original Message-----
>From: "Buehler, Martin" <Martin.Buehler@keymile.com>
>Sent: Sep 11, 2006 5:37 AM
>To: "Microcontroller discussion list - Public." <piclist@mit.edu>
>Subject: [EE] detecting if Computer with dynamic ip is on-line
>
>
>when using fixed ip, i can use ping to check if a computer is up and
>running.
>if i have dynamic ip, i cannot do this as i do not know the actual ip.
>is there a way to do something like ping, but directly going to the mac
>address instead of the ip?
>thanx!
>tino
>
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>http://www.piclist.com PIC/SX FAQ & list archive
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