Speed drops in the evening

pgruetter · 2021-01-22T12:47:47+00:00

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pgruetter

Got gigabit which worked flawlessly since activation. For a few weeks now, I get massive speed drops from 960 Mbit/s to 20-30 Mbit/s. Upload mostly stays at 100 Mbit/s. This only happens in the evenings.
Speed drops around 5 PM gets worse around 8-9 PM and at midnight turns back up to 960 MBit/s

I tried to run cnlab speedtests multiple times with the settings described on the UPC page. Somehow, for each 12 hour measurement, one or two measurements fail to turn up in UPCs system.

So far, they refuse to escalate the case to a technician unless I can provide a complete 12 hour measurement. When given the UID, they even saw all 12 values but technically they can’t forward it if the 12 measurements don’t turn up in the internal system.

Does anyone see similar effects? Speed drops in the evening?
More importantly: Not having all measurements sent correctly?

I understand they need to have their standards to send a technician, but I fail to see what more I can do here.

Daniele_Sunrise

pgruetter , Welcome to the UPC Community!

We are missing informations about your home network, such as components, computer, connection type and what you have already tested.

What I have found out so far is the following:

you have two devices connected via LAN (x.x.0.2 + x.x.0.5)
internally a Linux computer distributes possibly further IPs in the range 192.168.1.x (Asustek)
over the Asustek runs a Dell computer, which has done the speedtest at CNLAB

If you do a speed test, please connect the computer directly to the modem and do not connect anything in between. You can find detailed instructions in the footer of the community under Speedtest.

Do you have a double NAT at home (1x modem, 1x Asustek)?

Greetings
Daniele

pgruetter

Daniele_Sunrise
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).

Daniele_Sunrise

pgruetter , Thank you for your feedback. I’m not a network professional and would not be much use for further help 🙁. We have other community users who can certainly give you tips for troubleshooting.

A small additional question:
Do you see in your logs on the router if you have background services running during the times when the speed is not good, like backups, updates, etc?

Greetings
Daniele

pgruetter

Daniele_Sunrise

Thanks for your help. My main question is how I can make sure that UPC gets all the information they need to help me. If I do additional tests and each time the excuse is “we didn’t get all measurements, there’s nothing we can do to help you” I’ve got a problem.

Regarding your additional question:
There is always something running ;-) But seriously: Backups only run between 1 AM and 3 AM. That’s the time the speedtest also show me full speed again.
During the time of slow networks, there is nothing big running, no.

To be honest, even if we were watching Netflix in 4K our download should maybe go down from 960 to 930.
Not to 20 MBit/s….

Daniele_Sunrise

pgruetter , The procedure is as follows:

You make a Speedtest LAN measurement series according to the following instructions:
After the speed test is finished, you contact the support with the CNLAB UID(s).
tell them what your exact error pattern is (at certain same times the speed drops)
ask them to check the load of the distribution box on the street (CMTS)
to do this open a ticket, ask for the number
you will be informed about the results via SMS or callback

Greetings
Daniele

pgruetter

Daniele_Sunrise
In my case it went like this:

I make a Speedtest LAN measurement series according to the following instructions:
After the speed test is finished, I contact the support with the CNLAB UID(s)
I tell them what my exact error pattern is
I ask them to check the installation
They refuse because they tell me that the speed test I did in step 1 is incomplete, they only received 11 of the 12 measurements. They can see all 12 values on the website but not in their system. They confirm the pattern, but there’s nothing they can do.
🤨
But I will try again this evening with another notebook. Thanks for your help.