I got a Dell r620 server with iDrac 7 express. It has a dedicated NIC for the DRAC. If I connect any cable to it and to the router, the LED doesn't turn on, like when there is no physical connection.
The only way I found do iDRAC to work, was to user another NIC, than the dedicated one.
Is this a software limitation of iDRAC express, or can it be a hardware failure?