Hi, When I am running (for a Mellanox Connectx-2 NIC): lspci -vvv -s 0000:01:00.0 | grep Serial I get : Capabilities: [148 v1] Device Serial Number 00-02-c9-03-00-57-b1-00 The MAC address of the device is 00-02-c9-57-b1-00; this is the output of the above lspci command without the two inner bytes of 03-00 I noticed that I get the same thing with other NIC devices from other vendors(I mean that the the MAC address is the result excluding the two inner bytes); but the values of the inner bytes differ. For example, in a different case I got "ff ff" as the two inner bytes, My question is: what does the "03-00" and "ff-ff" (and probably other values for other nics) mean and how can I decipher them ? And what is [148 v1] which immediately follows: "Capabilities:" in the output of the lspci above? in a different nic I got 140 and not 148, like this:"Capabilities: [140 v1]" Regards, Kevin
