How to analize a machine with a NIC?

a colleague brought me a machine (metal detector) that has a small linux in a card and the only way to connect that machine is via Network card. The thing is that He (and me) don't know anything about this machine, we don't have a way to guess its IP address (so we could scan ports or guess, at least, wich operating system version it has).

What I am thinking, and not tested yet, is to run a linux notebook, and try to use some auditing tool like nmap or an sniffer, then wait for the software to receive anything that may come from the machine.

What it is strange to me is what would happen if the machine does not send any packets... so my question would be... is there someway I can connect a linux notebook with this machine (or network card) through a network cable, and force this machine to answer to my linux notebook? so I can finally get the IP of this machine??
José PerezAsked:
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A NIC can be deceptive, while appearing as RJ45 it could also be a serial/console interface.
Determining for certain is best to identify the device and locate its specs.

If you' believe it is a NIC, on your nil yd notebook. Use all encompassing IPs:
Tcpdump to capture any traffic coming accross a cross cable patching /connecting the two systems.
A broadcast, arp ....

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Mohammed KhawajaManager - Infrastructure:  Information TechnologyCommented:
Most NICs on devices are set to obtain IP from DHCP.  I recommend you setup a DHCP, plug in the device and check DHCP server to see if the device obtained an IP.  Once you have verified the IP, then use NMAP or a similar app to scan the IP.
José PerezAuthor Commented:
I tried already using a DHCP server but it did not took an IP. Probably the machine is configured to use an static IP instead of Dynamic.
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Device info, manufacturer, model, the RJ45 looking connection could be a serial/console port.
José PerezAuthor Commented:
ups I don't have the device with me, now... Tomorrow I should have some way to solve the mistery of the nic.
José PerezAuthor Commented:
The device info is:

"Anritsu Metal Detector Serie DUW-h"
Unable to locate specs, their promo on YouTube suggests that there is a control panel one can use to configure the system.  Check that out to see if you have system settings for network.  I think that Rj45 is actually a serial/console port rather than a network port.  
Contacting their support might be a more straight forward approach to get your question answered.

See if there are markings of three computers (three squares with a line running among them.) or there is a different marking that will indicate what  this port is for.

Unfortunately, none of the images I've seen are close enough where one could even see the port you mention.  The metal detector is part of a contraption that the RJ45 looking device might actually be an I/O in/out to the device it is controlling. i.e. activate one relay to move the belt on which Item are, activate another relay to have the device perform another function, etc. with one sensor indicating a fault/stop.
José PerezAuthor Commented:
mmm maybe you're right... suppose it is a serial/console port, do you know how can I receive information from it?
In the old days of windows 95 I rememeber using hyperterminal for tasks simillar to it...
hyperterminal/putty, zterm,etc., with a null modem if needed. it depends on its setup i.e. serial computer to computer the receive on one side go to the transmit on the other side (network terminology a cross cable) though serial is different. versus computer to device.
rj45 to DB9 might do the trick if it is a serial port

If the device is functional, I would recommend that you contact the support in your region.

And get the information you need.  There is nothing worse that after guestimating/plugging things in, the port/device gets fried because the wrong thing was plugged in.
you only have the sensor part not the entire assembly.

Best call them up, and see what info they would provide.  Unable to locate any spec for the device that includes info you are looking for.
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