Dear All I have a strange problem, when I plug the network into any pc in my network I find that the performance of PCs is degrading, to the extent that if I need to run Autocad or 3D max I have to disable my network adapter or unplug the network cable. Till now I can't find an analytical reason for this problem or the remedy for it, so would you please help me solving this problem? Thanks in advance for your sincere cooperation.