Tool that notify when a new device is plugged into a network

[Guest]

Hi everybody,
Recently i had the following situation:
Someone connect a new PC into my LAN with DHCP service active so PC`s of my
network sometimes obtain IP addresses out of our scope.
We have Traffic Analyzers, etc but i am searching for any tool that will be
capable of notify or warning when a new device is plugged into a network
Do you know one ?

Thanks a lot,
Nico.

 

[Guest]

Hi everybody,
Recently i had the following situation:
Someone connect a new PC into my LAN with DHCP service active so PC`s of my
network sometimes obtain IP addresses out of our scope.
We have Traffic Analyzers, etc but i am searching for any tool that will be
capable of notify or warning when a new device is plugged into a network
Do you know one ?

Thanks a lot,
Nico.
If you go on www.simtel.net and search for 'network' and there may be some good results