He have a problem in our almost 100 desktop PC and 10 servers LAN.
Someone or something changed it's IP to a server's IP and LAN has become crazy.
We have found the zone where this Network card (wired or wireless) is by plugging and unplugging cables from switches and testing LAN performance.
When we plugged a switch cable off (that cascades from other remote switches) the LAN stabilized and we think that the duplicated IP is there.
Our preocupation is: How can we prevent that some device can use a server (or desktop) used IP?
All domain PC has non admin rights and are not able to change it.
Witch is the security protocol for this cases? block traffic by mac on switches?
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