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Network Monitoring

I work for a non-profit and I am looking for a free way to monitor all workstations/network devices on our network. I have used Zenoss and Nagios in combination with each other for several years, but I also want a way to be notified if someone plugs a personal devices like a laptop in the network. Zenoss and Nagios are currently keeping an eye on my end points letting me know the network status.

     I have considured Filtering MAC Addresses with Windows Server 2003 DHCP, but want to know all of my options.

Thanks,
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Commented:
Have you considered Spiceworks? www.spiceworks.com

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Commented:
netcmh,

  Yes I have Spiceworks, but it does not seem to notify us quickly of new devices on the network. Do you have any articles from the Spiceworks community that explains how to speed up the detection/notify process?

Thank You,
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Commented:
I don't have the documents handy, but you can use snmp monitoring of your switches and routers and immediately detect link state of ports and what's connected to them.
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I'm needing to know when new devices connect to our network.
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Yes, when snmp on the network devices senses an addition/deletion across any of it's ports, it sends back a trap to your spiceworks poller. That'll be your detection piece. You can then write a notification trigger to either send you an email or just display on the logs events.
Commented:
snmptrapd on a linux machine, sends a trap to a machine on a port goes down or up.

cacti witch mactrack.

or if you can make 802.1x auth on switches, with AD user/pass, and then everybody will have network acces with user and password.
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Commented:
Thank you for the grade. Good luck.

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