> There are more than one NIC-model with 82599EB and evidently not all work with > the CentOS driver. What we're using successfully is X520-DA2: > > Intel Corporation 82599EB 10-Gigabit Network Connection (rev 01) > > What do you have? http://www.intel.com/support/network/sb/cs-012904.htm PCI id 151c = X520-T2.