[c-nsp] Finding Ip of Stanalone Machine.

[Gert Doering]

Hi,

On Wed, Jul 19, 2006 at 04:53:05PM +0530, Sam Jacob wrote:
> I ve been asked this question by a colleague of mine.
> 
> Assume that you have a Standalone PC with an IP Address configured and you
> have no access to this PC.
> 
> How do we find out the IP Address of  this PC if  you are allowed to use its
> network interface and any cable of your choice (Straight or Cross Cable ).

There's a good chance that the PC will send out packets of its own 
after a link up/down event.

So connect another machine with a crossover cable, and a sniffer
(tcpdump/ethereal) running on that machine, to the PC in question - 
and watch for traffic.

If you can reboot the PC (not always an option) you can pretty much
rely on a gratuitous ARP request going out upon configuration of the
LAN card.

Others have suggested doing broadcast pings - this might work, or might
not, depending on the OS in question.  Windows will *not* respond...

Ah, of course: if you know the PCs mac address (by whatever means),
"arping" (Linux/Unix tool) might bei used to poke the PC to get the
corresponding IP address.

gert
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Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de