recommended network scanner out there?

What do you guys recommend as far as scanning your network for known/unknown devices connected to it? Looking to implement a solution for this. And why do you recommend it? thanks in advance!
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Mustafa L. McLinnSystems Engineer/Systems AdministratorCommented:
As far as passive scanning I would recommend Wireshark.
Otherwise I would setup Nagios
Dan CraciunIT ConsultantCommented:
Wireshark? That's for packet capture and analysis.

Nmap is the most widely known free network scanner. Very powerful, but a bit arcane. Definitely worth reading the manual.

As far as knowing what devices you have connected, your router is the definitive source for it. Any enterprise router can give you a list of connected devices (MAC+IP). After that you can use Nmap for fingerprinting those clients.


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RVFB ITAuthor Commented:
what is out there that might alert us via email if an unknown device were plugged into our network?
If you're looking specifically at wireless devices, then this might work for you:

There is a free version you can try.

You haven't mentioned how large the network is that you want to monitor.
RVFB ITAuthor Commented:
not really looking at WiFi devices at all. The network i'm monitoring is a medium sized business network
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