Rogue device and MAC address tracing
Posted on 2009-02-24
Ok, I'll start by describing our setup:
LAN with 1 router
plugged into router is: 1 cable broadband modem, 3 switches
Switches connect to floor sockets in the office (therefore I can identify any device if I know which switch and port it is connected to)
Running Mac OS 10.4 and 10.5
We have a NAS with a fixed IP of 192.168.0.14.
Recently I have noticed problems of it disconnecting and received a warning that it's IP address was taken.
It seems that another device is repeatedly attempting to utilise this IP address. Problem is, when I look at DHCP table of the router, I only have the MAC address.
I have ruled out as much of the office as I have access to but have not yet found the offending connection.
Is there any way (in a Mac OSX environment) of identifying who the MAC address belongs to, what port of my switches it is connected to or any other info that might help me trace this?
Any help greatly appreciated.