Problem 1:

I have a computer on the network, with dynamic IP assignment.
One fine morning i found my computers ethernet address is changed to broadcast mode (ff-ff-ff-ff-ff-ff). I know network card address is permanat but it can be changed or spoofed for the session.

Is there any way administrater through policies can set a computers mac address into broadcast mode remotley.

Problem 2:

any one can find the mac address of the server through arp and they spoof the mac address, as the computers are connected to network an dynamic ip address will be assigned to them. It would be same as the servers ip address, leading to 2 machines with same ip address. Is there any way to locate who has spoofed the mac. in the network.

I will be greatful if you people can clear my doubts.

thanking you
r. anbalagan