Manually setting connection speed to 1Gbit/s instead of 100Mb/s

Ok so since i switched over from win10 i couldn't get 140Mbit/s internet connection as per contract and once i started messing arround i found this:

sudo lshw -C Network
[sudo] password for home:
*-network
description: Ethernet interface
product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:03:00.0
logical name: enp3s0
version: 0c
serial: e0:d5:5e:3d:70:57
size: 100Mbit/s
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet
physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
configuration: autonegotiation=off broadcast=yes driver=r8169
driverversion=2.3LK-NAPI duplex=full firmware=rtl8168g-2_0.0.1 02/06/13
ip=192.168.100.17 latency=0 link=yes multicast=yes port=MII
Nox Showbox Mobdro

speed=100Mbit/s
resources: irq:31 ioport:d000(size=256) memory:fe800000-fe800fff
memory:d0000000-d0003fff
and i tried to manually switch it to 1Gbit/s with

sudo ethtool -s enp3s0 speed 1000 duplex full autoneg on
and i just lose connection untill i run the command again with speed 100. I used the same cable and lan card on win10 and had the full 140Mbit/s connection, how come it is not working now.

And also what is the difference between enp3s0 and eth0, almost every site i searched only mentions eth0 and very rarely enp3s0.

Edit: this is the real lshw after the ethtool command ignore the one above

 

It's autonegotiating to 100mbps, are you sure it's plugged into a gigabit port on the other end?

It's called enp3s0 because of its PCIe bus location, has to do with udev/systemd naming schemes. You could rename it if you want by creating a udev rule or modifying /etc/udev/rules.d/70-persistent-net.rules or similar

https://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames/

 

Could you try switching to the official realtek drivers? This blog entry documents the process. https://www.unixblogger.com/how-to-get-your-realtek-rtl8111rtl8168-working-updated-guide/