Hi, The kernel is telling you that it doesn't recognize the card. It will not load a module and therefore you've got no device. And that's what the network restart command is reporting. Google says that the realtek card has its own source package that needs to be compiled manually. It will provide the r8169 kernel module, which should be able to load fine in a general purpose kernel. Depending on the distro you're using somebody might have done the compile for you and you can download it as a package! Otherwise download the source code, untar, run make in the created directory and modprobe -r the created module (if no errors...) Good luck!