Networking

[gabriel]

Using (lsb_release -a)(Laptop B(Host))
Distributor ID: Ubuntu
Description:    Linux Lite 4.2
Release:        18.04
Codename:      bionic

So, i have laptop A (windows 10) & Laptop B (Linux Lite 4.2), in addition, Laptop B has 2 "VirtualBox" VM's
VM[1] Linux Lite 4.2 (same as HOST)
VM[2] Distributor ID: Ubuntu {Description: Ubuntu 18.04.1 LTS} {Release: 18.04} {Codename: bionic}

Both Laptop A & Laptop B have a USB 3.0 port...
using the above mentioned port, there is connected a TP-LINK-UE300 (USB to Gigabit Ethernet) on both ends & using a cable CAT 5e

anything going through (either of) the TP-LINK-UE300 has segregated IPv4 traffic on 192.168.168.X
Laptop-[A][IPv4]192.168.168.2  [SUBNET]/24  [GATEWAY]NULL
Laptop-[.B][IPv4]192.168.168.1  [SUBNET]/24  [GATEWAY]NULL
Laptop-[.B]-VM-[1][IPv4]192.168.168.5  [SUBNET]/24  [GATEWAY]NULL
Laptop-[.B]-VM-[2][IPv4]192.168.168.247  [SUBNET]/24  [GATEWAY]NULL (Installed 27-DEC-2018@2230H)

Using IPERF3
Laptop-[A] iperf3 -s
* the rest apply as iperf3 -c 192.168.168.2

Results
[R.1] Laptop-[.B]--TO--Laptop-[A]=944 Mbits/sec
[R.2] Laptop-[.B]-VM-[1]--TO--Laptop-[A]=466 Mbits/sec (and several Retr at times..)
[R.3] Laptop-[.B]-VM-[2]--TO--Laptop-[A]=947 Mbits/sec

So in my opinion the above tests rule out any problems with virtualbox

and i tested also with mikirotik routeros as a VM (using its own bandwidth testing feature) and i obtained circa 400 Mbits/sec

before & after testing all this i used "make clean" & "make" & all the installation procedure for the r8152-2.10.0 driver

but i got same results

Can anyone help with some kind of fix pls ?

*had to make ".B" due to bold