Legacy Products
The resources associated with these products have ceased their development and are no longer supported.
D-Link Systems, Inc. recommends retiring these products and replacing them with products that receive firmware updates.
Does the MGT port of each Controller in a dual-contoller DSN-5000 series need to be in the Same network?

Yes, The DSN-5000 series primary array will not bind controllers if sister Ethernet port is not in the same broadcast domain/arp table.