Strange drop off in speed every evening
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- Re: Strange drop off in speed every evening
Strange drop off in speed every evening
24-06-2015 11:04 PM
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The router is connected on ADSL2+ with a good 17/18mb down and 1mb up and during the day is working absolutely fine. However every evening around 6pm the speed tanks to about 3-4mb.
What's interesting though is that the line remains stable and no change in sync or errors.
Additionally I have the pro add-on for completeness.
As an example this morning I pulled down a 2gb file in about 40 minutes or so.
From the same server (single IP no load or regional balancing) took 4hrs this evening...
The only thing I can think of is contention upstream from my connection.
I am on the home unlimited product, but cannot remember the contention ratio.
Any ideas/help appreciated.
Line Statistics
Downstream rate: 18589Kbps, Upstream 1084Kbps
SNR Margin 6dB , Attenuation 18dB
Re: Strange drop off in speed every evening
25-06-2015 2:35 PM
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Don't worry about contention as that hasn't been an issue for years.
Diagnostics aren't showing me any problems so I was just wondering if you were connecting over WiFi or ethernet?
Can you test over ethernet tonight if you haven't already please?
Re: Strange drop off in speed every evening
25-06-2015 3:00 PM
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All testing on this has been conducted directly connected via Ethernet to the router which is on the main house socket, and I have also plugged directly into the test socket for comparison.
I'm an IT consultant so fairly certain that there is nothing wrong on my end and I have been monitoring traffic to make sure there is no unusual things going on here.
I can remember though a 'cludge' being applied to my line to stop the exchange SNR margins etc. might be a cause when noise goes up on B-end, might be worth a look and remove it as was not a problem prior to this.
Re: Strange drop off in speed every evening
26-06-2015 11:58 AM
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Have you stayed up and tested to see when it improves?
How long has this been going on for? days - weeks- longer
Re: Strange drop off in speed every evening
26-06-2015 1:11 PM
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No disturbance in electrical power across the house.
Only seems to have been going on for a couple of weeks. Thought it might have been down to engineering work, but that would not have gone on this long.
It's definitely upstream of my connection as have tried with a different router as well and get the same effect.
General window for the effect is 6-11pm everyday, have not measured at weekend yet but will do this weekend.
Re: Strange drop off in speed every evening
26-06-2015 8:06 PM
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Quote from: Madmac It's definitely upstream of my connection as have tried with a different router as well and get the same effect.
General window for the effect is 6-11pm everyday, have not measured at weekend yet but will do this weekend.
Sorry to high jack a thread. However I wanted to add weight onto this. I have exactly the same issue. I have gone ot the point of using the old AM Trick to detect noise. Turned everything off bar the router and bam just after 5.30PM the speed / page load times rocket. around midnight they return to normal.
I am 99.99% certain that it isn't my line as I am a recent subscriber to PlusNet and my line was near perfect with my previous ISP. (I can see my exchange from my bed room window and a number of BT engineers have confirmed the line length is less than 500mtr).
Re: Strange drop off in speed every evening
27-06-2015 11:04 AM
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Can you try running a BT Speedtest when the issue happens? http://speedtest.btwholesale.com . If the first test fails you'll have the option to run what's known as a TAP3 test which goes straight to the exchange rather then ourselves.
@zapto
We're seeing a high amount of upload traffic coming from your line which will most likely be causing issues with your download speeds. If that's a live ping graph in your signature the high upload has caused your average pings to shoot up. Can you try running a test with nothing running in the background?
Re: Strange drop off in speed every evening
29-06-2015 11:02 AM
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Have run the BT Speedtest tool but cannot get to the TAP3 test as from BT's perspective there is no fault on the line....
That said though I have now run a series of different speedtests including the BT one and they all have the same result.
During the day, I get a perfectly clean service with - 15.03Mbps down, 0.93Mbps up with ping latency of 25.25ms - BT Wholesale Speed test service
yet after ~7pm the speeds drop to - 4.33Mbps down, 0.66Mbps up with ping latency of 159ms - BT Wholesale Speed test service
This is with no change in line profile, router still connected and reporting a good service.
For comparison all testing has been completed with me physically connected to the router and all other devices disconnected/WIFI off at router.
This is an upstream issue as without any intervention the speed will return ~11-12pm and the router remains connected without loss of service or line reset.
Also updated screen name to match user name for ADSL service for the purpose of resolving this.
Re: Strange drop off in speed every evening
08-07-2015 11:11 PM
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Additional information that shows dropped packets which is also backed up by resend logs on the router, again only during evening hours.
Re: Strange drop off in speed every evening
08-07-2015 11:28 PM
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Re: Strange drop off in speed every evening
09-07-2015 9:57 AM
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Quote Have run the BT Speedtest tool but cannot get to the TAP3 test as from BT's perspective there is no fault on the line....
That sounds like the first test didn't come back with low speeds? It's worth giving it another go when the issue is occurring and it should let you go through to the second test at that point.
I've checked the exchange reports and there are no reported capacity issues there. If it continues I'd suggest opening a fault ticket so we can dig further.
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- Re: Strange drop off in speed every evening