Discover IP/MAC address of Cisco device

If a Cisco device has CDP protocol enabled you can easily discover it’s IP and MAC addresses. You have to connect the device to your laptop (via network interface) and run Wireshark application. Then caputre the frames on your network interface:

CDP protocol frame

CDP protocol frame

If you click double the selected line (CDP frame) then you can see more details (for example IP address):

CDP details

CDP details

In this case the device’s IP address is 192.168.1.101

Leave a Reply

Your email address will not be published. Required fields are marked *