In order to change the controler configuration to duplex, open the configuration manager, go to Devices tab > Enterprise Management window > double click on the storage array for which you want to configure the controller network settings > click the Physical tab > highlight controller A and select Controller > Configure > Ethernet Management Ports. In the new page make sure that you set 10/100 Mbps, full duplex in the drop down menu next to Speed and duplex mode. You should follow the same process for the second controller. For additional information, check the Setup Guide from the following website.