Is there a way to discover what subnet a device is using?

[Drew Einhorn]

Just in case someone finds this thread in the future.

Depending on the vintage of the computer and external drive you may need a
crossover cable instead of a normal patch cable

On Thu, Mar 5, 2020, 8:57 AM Chris Green <cl at isbd.net> wrote:

> On Thu, Mar 05, 2020 at 03:36:14PM +0000, Chris Green wrote:
> > On Thu, Mar 05, 2020 at 09:42:16AM -0500, Ken D'Ambrosio wrote:
> > > On 2020-03-05 08:01, Chris Green wrote:
> > > > So is there any tool that I can install on my laptop which will try
> > > > and get some sort of response from the WD box and help me identify
> the
> > > > IP address?
> > >
> > > Your best bet: plug the laptop and the WD box straight into each
> other, and
> > > use Wireshark to sniff traffic (be sure "promiscuous" is set!).  It'll
> > > likely do *something* when it comes up, like try to check for an NTP
> server
> > > or something.  The being-plugged-into-each-other is important; merely
> being
> > > on the same switch won't work, as the switch will be smart enough to
> not
> > > send unicast packets on all interfaces, so your laptop won't see them.
> > > (There are ways around that, but far easier just to plug straight into
> each
> > > other.)
> > >
> > Yes, OK, I wondered if Wireshark might be of some use.  I'll try it,
> > thanks.
> >
> ... and, yes Wireshark showed me what I needed.  There was a short
> learning curve and then running Wireshark on the laptop's ethernet
> interface connected only to the NAS showed me what I needed to know.
> With only the NAS and the laptop there wasn't too much traffic.
>
> --
> Chris Green
>
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