Once you find the cable then you have to find where it goes physically from there.Īlternatively you can run CDP or LLDP on all switches until you find the adjacency for the device in question. Eventually you will trace it to the switch it is plugged into. If it is the port of another switch, login to that switch and run the exact same command as above. ![]() This will give you either the port the device is plugged into or a port of another switch. Next: (replace x's with mac address found above) This will give you the mac address you are looking for to track this device down. This will give you the entry in the arp table which has the IP address to mac address association. x.x.x.x is for the ip address of the device. On whatever device is hosting layer 3 for that specific subnet run the following command. The below commands are assuming cisco switches. ![]() ![]() And that Mac must be in your CAM tables on the switches. If the device is reachable on your network, it must have a mac address. I would suggest not tot trusting the scanner app for a second.
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