Hi, for the The hash for the file is not present in the specified catalog file. The file is likely corrupt or the victim of tampering. message, you can try to disable driver signature enforcement on windows 2k12, go to charm menu, settings, power, hold on to left shift key before pressing the "restart", click on troubleshooting, start-up settings then proceed with "restart". your system will restart and provides you option to "disable driver signature enforcement".
I've check on the Intel website and noticed that I281-V is not supported by Intel driver on win2k12, that can be the reason why you're encountering the problem rather than the NIC is broken.
Link below:
https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=23073&lang=eng
NOTE: The following devices do not have driver or software support for Windows Server 2012 R2:
- Intel® Ethernet Connection I217-V
- Intel® Ethernet Connection I218-V
- Intel® 82579V Gigabit Ethernet PHY