Hi, I have a problem with the internet speed via CAT 6 cable . My package is m350. But my speed only reaches 100Mb/s. In the "Speed & Duplex" network card settings, I have 1.0 Gbps Full duplex set.
The problem has been occurring for about a week, every time I have to reset the router (HUB 3) and full speed returns, but sometimes the Internet disconnects itself and limits the speed to 100Mb/s.
Sounds like a faulty cable/RJ45 plug. 100M only need 3 pairs of wire and 1G requires 4 pairs of wires in the Ethernet cable.
New cable and set your network card back to auto negotiate. 100 Mbps needs two of the pairs (not even three) while gigabit requires all four pairs. If it still fails, try a USB network adapter it could be a bad NIC.