Je zou om mee te beginnen op de server het volgende commando's kunnen uitvoeren
sudo apt-get install inxi
[Enter]
inxi -iz
[Enter]
Daarin zou “speed: 1000 Mbps duplex: full” behoren te staan. Dit kan eventueel worden aangepast via ethtool. Info over die applicatie is onder ander te lezen in deze Engelstalige Ubuntu Geek hyperlink http://www.ubuntugeek.com/how-to-change-ethernet-network-card-speed-and-duplex-settings-in-ubuntu.html
Helaas, geen verbetering. ethtool had ik ook al gebruikt met de 1000 Mbps duplex: full optie.
Network: Card-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
driver: r8169
IF: enp1s0f0 state: up speed: 1000 Mbps duplex: full
mac: <filter>
speedtest-cli
Retrieving speedtest.net configuration...
Retrieving speedtest.net server list...
Testing from XS4ALL Internet BV (************)...
Selecting best server based on latency...
Hosted by INTERACTIVE 3D B.V. (Rotterdam) [35.89 km]: 9.097 ms
Testing download speed........................................
Download: 483.00 Mbit/s
Testing upload speed..................................................
Upload: 85.86 Mbit/s