We have a strange issue with on our customers. Since a couple of weeks he gets an error message stating that there is a duplicate IP address for the address of one his vlans. This message gets back on regular times so we thought somebody had an illegal DHCP server.
So we changed the ip address of the vlan but then we got error messages on the new IP address.
I don't see anything wrong in the switch config .
Does anybody have seen this before ?