Thanks for your reply. I’ve done different tests over the last 3 weeks.
Yes, my UPC modem has a subnet of 192.168.0.0. Usually the only device connected to the UPC modem is the Asus Router (Asustek you’ve mentioned). The modem is NOT running in bridge mode, correct.
I’ve done several tests, the ones last week where done with a Dell Notebook running Linux, connected directly to the UPC modem.
The tests yesterday where done with the same Dell notebook behind the Asustek router.
The Dell notebook you mention with the latest test is my work notebook running Windows. The support asked me to start the speedtest again with a different notebook. I just did a quick test, will connect this machine directly to the modem tonight to let it run for 12 hours again.
I did a lot of the tests behind my router. I’m aware that this is not what UPC will accept. It’s just that I run a Linux server on the 192.168.1.0 subnet which acts as DHCP server. To test directly on the modem is a hassle, so I only did it for the “official” speed tests that I wanted to communicate to UPC.
For your question:
Behind the Asustek there are 4 managed switches with around 30 devices in total. So yes, it’s always difficult to simply “disconnect everything for 12 hours” just for yet another test. ;-)
Everything is on CAT 6e or CAT 7 cables.
Maybe as a sidenode: With this complete setup (Asustek behind modem, server distributing IPs etc), I always got the “full” 940-950 MBit/s. The drop in speed is very consistent, no matter if I test directly on the modem, behind the Asustek or 3 switches over from the cellar on the first floor).