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Intel X552 (FreeNAS) to Mellanox ConnectX-3 (ESXi) over Mellanox DAC: both ends see no carrier
A FreeNAS box with on-board Intel X552 SFP+ ports (Xeon D) and an ESXi 6.7 host with a Mellanox ConnectX-3 (MT27500, Dell Y3KKR) were cabled with two Mellanox MCP2104-X003B passive DACs from 2014. Looping each device to itself brought the ports up, but between the two systems ESXi showed…