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167 posts

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Topic # 116899 13-May-2013 15:18
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My customer has had a good run with their ADSL in Milford until a couple of weeks ago when throughput suddenly got erratic, and would go awful from time to time.

Main symptoms of throughput are Thunderbird mail client unable to connect with smtp.gmail.com to send mail mainly on big emails, websites timing out, Outlook freezing.

I ran a ping test to google.com and at the same time looked at Speedtest.net and also the Youtube test video. Everything looked great for 10 minutes or so, 5M down, 0.7M up, ping delay ranging from 35m to 100m even while streamed HD video. And virtually no packet loss (<10) showing on the Youtube video stats.

Then after 10 minutes the Youtube video froze and packet loss soared into the thousands, and test email sending failed. However, and here is the weird bit, the DSL link stayed up and the ping test hardly murmured (latency did go out to 250m but no lost pings). 

Vodafone say there have not been any recent DSL resets. But the customer gets glitches several times every hour.

We tried originating and receiving phone calls on the line, and checked for filters in the right places. Nothing wrong there (but horrors, no master splitter).

In summary here is a good looking ADSL connection, which glitches occasionally from a number of different clients on the network, including 2x XP workstations, 1x iPad, and a Vodafone Sure-Signal also goes down (I think they said the phone signal level display drops away completely during a "glitch").

Given the almost continuous good test results, and the lack of DSL resets, and the continuous good ping even during a "glitch", I believe the physical network must be ok. I suggested the modem replaced, and then the DSLAM port get changed if still problematic.

Has anyone seen anything similar to this? Are there any tests which can be done to shed further light?


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  Reply # 816799 13-May-2013 15:18
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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.



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  Reply # 816810 13-May-2013 15:24
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Are you testing over WIFI or LAN cable?



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  Reply # 816959 13-May-2013 18:51
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johnr: Are you testing over WIFI or LAN cable?


The testing was from one of the two Windows XP clients which are both - and the Sure-Signal unit - all ethernet connected. The iPad is wireless.


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  Reply # 816963 13-May-2013 18:54
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Any reason they don't have a master filter or have they only got one dedicated jack point for ADSL in the place?

Approx where are they located?



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  Reply # 816976 13-May-2013 19:14
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johnr: Any reason they don't have a master filter or have they only got one dedicated jack point for ADSL in the place?

Approx where are they located?


Close to the beach, south side of Milford shops - no cell signal - no reason for not having a master filter, so do you think that is why the service is intermittent?




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  Reply # 816978 13-May-2013 19:16
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Foiler:
johnr: Any reason they don't have a master filter or have they only got one dedicated jack point for ADSL in the place?

Approx where are they located?


Close to the beach, south side of Milford shops - no cell signal - no reason for not having a master filter, so do you think that is why the service is intermittent?



To complete the answer no the jackpoint is not dedicated but the two phones and one fax are all in a small office and are all protected by filters.


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  Reply # 816983 13-May-2013 19:25
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Best idea get a master filter fitted DM coffeebaron here on Geekzone



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  Reply # 817053 13-May-2013 22:01
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Foiler: .. (re master filter), so do you think that is why the service is intermittent?

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  Reply # 817390 14-May-2013 13:23
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We will do some checks on the Vodafone side, Can you DM some details please

John

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  Reply # 817401 14-May-2013 13:49
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It could be the MTU on the router set incorrectly maybe?






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  Reply # 817445 14-May-2013 14:34
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michaelmurfy: It could be the MTU on the router set incorrectly maybe?


Yeah I was wondering about that, but the fact that everything runs so sweet for 15 minutes at a time doesn't quite fit with that does it?


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  Reply # 817467 14-May-2013 15:19
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Foiler:
michaelmurfy: It could be the MTU on the router set incorrectly maybe?


Yeah I was wondering about that, but the fact that everything runs so sweet for 15 minutes at a time doesn't quite fit with that does it?



Seems very strange, what is the MTU set as on the router?






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Master Geek
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  Reply # 817469 14-May-2013 15:26
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michaelmurfy: .. what is the MTU set as on the router?


Don't know .. but it will be the default value - presumably 1492?

Do you think it is worth trying a change to something like 1458?


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  Reply # 817474 14-May-2013 15:37
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No need to start playing around with MTU

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