ADSL2 very slow - connection stats supplied

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wsnz

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Topic # 129472 17-Sep-2013 11:36

Hi Everyone,

We're experiencing some very poor ADSL2 service suddenly. The router was swapped for a known working model at another site, so the next step was to look into the ADSL stats. Based on the stats below, if anyone could shed some light on the possible cause, it would be most appreciated.

A couple of the stats don't quite look right especially the downstream output power level. Note it's a TP Link so ratings are in .1 dB

SpeedTest results: Ping 545ms 2.2MBps UP and .10MBps down (varies widely)

Distance from the cabinet: Less than 100m

Relevant stats from the TD-W8960N router:

Router logs reveal a large number of the following:

Sep 17 08:38:53

user

warn

dnsprobe[1908]: dns query failed

Sep 17 08:39:57

user

warn

dnsprobe[1908]: dns query failed

Sep 17 08:52:23

user

warn

dnsprobe[1908]: dns query failed

Thanks for your assistance!

PeterReader

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Reply # 896833 17-Sep-2013 11:36

Hello... Our robot found some keywords in your post, so here is an automated reply with some important things to note regarding broadband speeds.

If you are posting regarding DSL speeds please check that

- you have reset your modem and router

- your PC (or other PCs in your LAN) is not downloading large files when you are testing

- you are not being throttled by your ISP due to going over the monthly cap

- your tests are always done on an ethernet connection to the router - do not use wireless for testing

- you read this topic and follow the instructions there.

Make sure you provide information for other users to help you. If you have not already done it, please EDIT your post and add this now:

- Your ISP and plan

- Type of connection (ADSL, ADSL2, VDSL)

- Your modem DSL stats (do not worry about posting Speedtest, we need sync rate, attenuation and noise margin)

- Your general location (or street)

- If you are rural or urban

- If you know your connection is to an exchange, cabinet or conklin

- If your connection is to a ULL or wholesale service

- If you have done an isolation test as per the link above

Most of the problems with speed are likely to be related to internal wiring issues. Read this discussion to find out more about this. Your ISP is not intentionally slowing you down today (unless you are on a managed plan). Also if this is the school holidays it's likely you will notice slower than usual speed due to more users online.

A master splitter is required for VDSL2 and in most cases will improve speeds on DSL connections. Regular disconnections can be a monitored alarm or a set top box trying to connect. If there's an alarm connected to your line even if you don't have an alarm contract it may still try to connect so it's worth checking.

I recommend you read these two blog posts:

- Is your premises phone wiring impacting your broadband performance? (very technical)

- Are you receiving a substandard ULL ADSL2+ connection from your ISP?

I am the Geekzone Robot and I am here to help. I am from the Internet. I do not interact. Do not expect other replies from me.

plambrechtsen

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Reply # 896852 17-Sep-2013 11:42

Looks pretty strange to me.

At that distance you should be able to get VDSL. I can run a line test, but you look like you are getting pretty near the maximum sync speed.

Could be something wrong with your router, or the site you are trying to access?

Have you tried the Telecom Speed Test server now in Speedtest.net? (making sure you select the Telecom speed test server that is in Auckland not any other Speed Test server that may be physically closer, but would most probably have much worse interconnect).

How does that server go for you?

Oblivian

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Reply # 896859 17-Sep-2013 11:54

And..

Using wired or wirelessly?

Using Xtras automatic assigned DNS or specified different server on PC/Router?

Latest router FW? (Incase it stops any wan side openDNS queries etc Dosing you)

nzkc

484 posts

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Reply # 896862 17-Sep-2013 12:04

From your info Im going to guess you have a similar problem I had in the past.

If you're doing a speedtest over wireless, try a wired speed test. If you get much better results I would suggest you are experiencing some wireless interference. Best way to test that is change the channel the wireless is using (this is what I had to do). By default they normally auto select, but I found forcing it to a particular channel resolved my problem.

michaelmurfy

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Reply # 896891 17-Sep-2013 12:52

I'd recommend trying a different router, seems like the router is at fault to me.

Michael Murphy | https://murfy.nz
A quick guide to picking the right ISP | The Router Guide | Community UniFi Cloud Controller | Ubiquiti Edgerouter Tutorial

cbrpilot

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Spark NZ

Reply # 896905 17-Sep-2013 13:08

So you're connecting at 21411/1144, but getting slow throughput?

Not sure how you'd get >1mpbs upstream!

How is your PC connected to your router? Do you have another device to test off there?

My views are my own, and may not necessarily represent those of my employer.

Inphinity

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Reply # 896911 17-Sep-2013 13:19

wsnz:

SpeedTest results: Ping 545ms 2.2MBps UP and .10MBps down (varies widely)

Have you reversed those up/down values? No way you're getting 2.2Mbps up. If it's actually showing that, have you tried a different speed test? As showing 2.2Mbps up would suggest the test is incorrect.

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wsnz

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Reply # 896961 17-Sep-2013 14:19

plambrechtsen: Looks pretty strange to me.

At that distance you should be able to get VDSL. I can run a line test, but you look like you are getting pretty near the maximum sync speed.

Could be something wrong with your router, or the site you are trying to access?

Have you tried the Telecom Speed Test server now in Speedtest.net? (making sure you select the Telecom speed test server that is in Auckland not any other Speed Test server that may be physically closer, but would most probably have much worse interconnect).

How does that server go for you?

The Telecom Speednet server reports 3MBps down and 0.13 up with a 495ms ping time. So over all, a similar result unfortunately.

The router has been changed with a known good unit, that instantly adopts the same behaviour when swapped.

Oblivian: And..

Using wired or wirelessly?

Using Xtras automatic assigned DNS or specified different server on PC/Router?

Latest router FW? (Incase it stops any wan side openDNS queries etc Dosing you)

The test is conducted using a wired connection, with Xtra's automatically assigned DNS with the altest firmware available for the router.

cbrpilot: So you're connecting at 21411/1144, but getting slow throughput?

Not sure how you'd get >1mpbs upstream!

How is your PC connected to your router? Do you have another device to test off there?

Unfortunately yes, I swapped the down/up values around in the first post - should have had my coffee before posting!

The same results occur no matter what device used to conduct the test. Now that I think about it, I wonder if there's another device on the network that we don't know about saturating the link. Given that the ADSL stats look okay to everyone it has got me thinking....

RunningMan

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Reply # 897049 17-Sep-2013 15:53

2.2MB/s downstream and 0.1MB/s upstream is very good for an ADSL2 connection, and appears consistent with your modem sync rates.

The only issue I see is the high latency (450ms ish), however. Can you post some results of traceroutes to various common places to see where the bottleneck may be?