Intruders on a lan.

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Hi guys this is the first time that I write on this service.
I am from Mexico so sorry for any syntax error.
Well, I would like to know if somebody is having problems with "intruders"
on your LAN?
Here is the history...
I am working in a company with several visits from corporate office and of
course I have to leave several services (network nodes) activated for these
visits.
Unfortunately, we received other kind of people (suppliers, consultants,
outsourcing etc...) , with their own pc´s, and they conect their laptops on
this active network nodes sometimes without asking for any permission to use
our LAN resources.
I have a DHCP server and of course I can not reserve IP addresses for each
pc that is conected to our network.
So, I want to know if somebody is using a "special" software in order to
"catch" any intruder in the LAN in real time, (we have seen some solutions
using hardare but it is not affordable for us), also the only way to check
for intruders is checking daily the DHCP server for unidentified pcs.
Do you know if there is a software solution for a Windows 2000 server
environment to check intruders in the LAN?.
Thanks in advanced.

MCP Ricardo Lopez
rlopez@xxxxxxxxx


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