On Sat, Jan 16, 2016 at 04:24:15PM -0300, Daniel Bareiro wrote: > > In fact, I tested it with a new TP-Link card with the same Realtek > chipset and I have observed the same behavior. > > Any idea what could be the problem? Disable autonegotiation on both sides; set it to full duplex 100. If the behavior persists, replace the cable. -dsr-