Comment 59 for bug 225749

@ Thomas

The RTL 8102E doesn't have a native driver under 8.10. Instead the r8169 module gets loaded, which may be the cause of your issues. One solution is to compile a driver for RTL8101/8102 using sources from Realtek.

Have a look at:
http://en.alessiotreglia.com/articles/how-to-compile-r8168-and-r8101-modules-for-realtek-ethernet-adapters/