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Severe speed/connection problems

kjaerligkatt
Grafter
Posts: 411
Registered: ‎02-09-2007

Severe speed/connection problems

I'm not entirely sure that this is the right place to post this, since there is evidence that is is not a simple speed problem.
Within the last 48 hrs I noticed a significant reduction in my browsing speed.  Yesterday, websites such as the BBC website, which normally open near instantly were taking 30 seconds to open.  I did a quick download/bandwidth test, and the result was about 500kb/sec.  I've been on an 8Mb connection for many years now, and usually enjoy 5-6Mb/sec, and rarely see below 3.5Mb/sec.  I put the low bandwidth down to especially high traffic at the time.  This morning the problem is more severe.  If I try to perform a bandwidth test, firstly the test takes about 30secs to begin, whereas normally I expect it to begin within couple of seconds and then I am seeing results around 300kb/sec.  When I visit many sites, they take 30-60secs to open e.g. www.bbc.co.uk and www.plus.net - typically there is a 30sec delay before the website begins to display, and then quite slowly.
I have tried to use http://www.speedtester.bt.com/ but it never seems to complete the test.  I get the request for Additional Verification, enter my username and about 40 seconds later it gets to the Testing ... Please wait screen.  It reached 'Progress: 96%', but seems to get no further.  I have left it 45mins and it has still not moved on from the 96% display.  Incidentally, whist waiting for this test to proceed, it is saying that:
"The Performance Tester is now testing Broadband connection. Your configured download throughput speed for this service is 6500 k
Please do not move away from this page and do not start any other download activity on your computer."
...which in consistent with my router connection report (Draytek 2800), which indicates an uplink sync of 448000 and downlink sync of 7616000.
Additional information:
- I have reset the router.
- There have been no software or hardware changes recently
- The problem is seen on a number of PCs when tested
- upload speeds seem unaffected, at about 350Kb/sec
The problem seems to have coincided with the network balancing work undertaken at PlusNet.
I think I've tested pretty much all I can at my end with the BT speedtester not working for me.  Whilst writing this I have performed a number of speed test, with both speedtest.net & the PlusNet broadband speed test, and all show between 300-550Kb/sec, and sometimes the download seems to pause for seconds at a time.
Is there anything else I should test?
Kind regards,  Neil
64 REPLIES 64
James
Grafter
Posts: 21,036
Thanks: 5
Registered: ‎04-04-2007

Re: Severe speed/connection problems

Hi Neil,
Looking at your connection logs I can see that you have been connected solidly for 5 days.
Can you try rebooting your router and see if this improves?
kjaerligkatt
Grafter
Posts: 411
Registered: ‎02-09-2007

Re: Severe speed/connection problems

Hi James,
Thanks for the fast reply.
Hmm, that's interesting - I rebooted the router earlier this morning to see if it helped, and when I just checked my router was showing connection time of 1hr43m.  Not sure why it didn't register as a disconnect/reconnect at that time.  Maybe this is indicative of the problem?
I have now switched the router off for 1 minute, and on reconnecting see the some problems  Sad  I left the BT speedtester 15mins just to be sure, and it still doesn't complete.
Kind regards,  Neil
James
Grafter
Posts: 21,036
Thanks: 5
Registered: ‎04-04-2007

Re: Severe speed/connection problems

Thanks Neil.  I can see your new connection now Smiley
Strange that your browing is still really sluggish.  Can you try setting the MTU on your computer and router to 1430 to see if this helps at all?
You can use Dr. TCP to set the MTU on your computer (if it's XP or before).
http://www.dslreports.com/drtcp
You may also want to try setting the rWin (receive window) which I'd suggest settng at 97300.
kjaerligkatt
Grafter
Posts: 411
Registered: ‎02-09-2007

Re: Severe speed/connection problems

I've changed MTU to 1430 on my main PC and router, and it doesn't help.  I cannot change rWIN due to Vista's auto-tuning feature.
It hasn't helped  Sad
I don't think a change to the MTU setting would explain why running the BT test at http://www.speedtester.bt.com/ never finishes though?
The screenshot attached shows you where it stalls - it has been in that state for about 40mins.
Nothing has changed at my end recently, and until 48 hours ago all was fine, and has been for years.
It's not just that download speed tests are slow - data transfer just seems to pause at times  e.g. type a URL into my browser, such as www.bbc.co.uk, hit return and then nothing happens for 20-30secs.  Then the webpage begins to draw, but again it will draw a bit, then pause for 10-15secs.  On the BT speed test website, it displayed half of the index page, then paused half way through the text - 20secs or so later it completed the page.  The same happens with progress during speedtest downloads.
Some of this feels like timeouts.
Thanks again,  Neil
James
Grafter
Posts: 21,036
Thanks: 5
Registered: ‎04-04-2007

Re: Severe speed/connection problems

Hi Neil.
I wouldn't worry too much about the BT Speedtetser.  It has bad days, and others not quite so bad!
I don't suppose you have another computer you can try on your connection to rule that out of the equation?
kjaerligkatt
Grafter
Posts: 411
Registered: ‎02-09-2007

Re: Severe speed/connection problems

Hi James,
Testing on more PCs is not a problem  Wink - I have 4 laptops and 3 desktops to choose from!  I've tested this on both my main PCvand main laptop, and both exhibit exactly the some problem.
I've just tried it on a 2nd laptop, and it is the same.  So 1 tower PC and 2 laptops are all exhibiting the same severe reduction is downloads speeds.  I checked my speedtest logs, and the sign of a severe slowdown was actually early evening last night, and from then on I've only seen download speeds of a few hundred kb/s - earlier in the day I was seeing about 3Mb/s which is not as high as the 5-6Mb/s I normally see, but certainly not the severe problem I'm now seeing.
Interestingly 2 of the speedtests I have just tried failed to complete - the progess bar got to about 90%, but then never completed nor returned a download speed - it just hung there.
Thanks again, Neil
James
Grafter
Posts: 21,036
Thanks: 5
Registered: ‎04-04-2007

Re: Severe speed/connection problems

Strange - Can you try running wireshark whilst you're browsing to some webpages?
The only other things that's left would be to replace the router.
kjaerligkatt
Grafter
Posts: 411
Registered: ‎02-09-2007

Re: Severe speed/connection problems

Hi James,
I will try wireshark next.  I have, however, just been trying some tracert test to www.plus.net, and getting some very peculiar results which seem to indicate some of the server hops are responding unreliably.  Some tracerts are fine (these are the minority), and what I would expect:
Tracing route to portal.plus.net [212.159.8.2]
over a maximum of 30 hops:
  1    <1 ms    <1 ms    <1 ms  my.router [192.168.1.1]
  2    43 ms    43 ms    42 ms  lo0-plusnet.pte-ag2.plus.net [195.166.128.72]
  3    40 ms    40 ms    41 ms  ge0-0-0-504.pte-gw1.plus.net [84.92.4.89]
  4    41 ms    40 ms    40 ms  te2-4.pte-gw2.plus.net [212.159.1.102]
  5    41 ms    41 ms    41 ms  ae0-102.ptn-gw02.plus.net [212.159.1.105]
  6    42 ms    44 ms    42 ms  gi0-1-31.ptc-gw1.plus.net [195.166.129.3]
  7    51 ms    49 ms    49 ms  pos1-0.pih-cr1.plus.net [195.166.129.250]
  8    50 ms    51 ms    53 ms  vlan8.pih-gw4.plus.net [212.159.0.30]
  9    52 ms    50 ms    51 ms  if25.pih-lb04.plus.net [212.159.0.18]
10    50 ms    50 ms    50 ms  www.plus.net.uk [212.159.8.2]
Trace complete.
So, all good and well.  However, the majority of the results are showing some quarter second delays e.g.:
Tracing route to portal.plus.net [212.159.8.2]
over a maximum of 30 hops:
  1    <1 ms    <1 ms    <1 ms  my.router [192.168.1.1]
  2    42 ms    40 ms    41 ms  lo0-plusnet.pte-ag2.plus.net [195.166.128.72]
  3    41 ms    56 ms    40 ms  ge0-0-0-504.pte-gw1.plus.net [84.92.4.89]
  4    40 ms    41 ms    41 ms  te2-4.pte-gw2.plus.net [212.159.1.102]
  5   231 ms   204 ms   223 ms  ae0-102.ptn-gw02.plus.net [212.159.1.105]             <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
  6    41 ms    42 ms    41 ms  gi0-1-31.ptc-gw1.plus.net [195.166.129.3]
  7    50 ms    49 ms    49 ms  pos1-0.pih-cr1.plus.net [195.166.129.250]
  8   251 ms   205 ms    50 ms  vlan8.pih-gw4.plus.net [212.159.0.30]                            <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
  9    52 ms    52 ms    62 ms  if25.pih-lb04.plus.net [212.159.0.18]
10    52 ms    53 ms    51 ms  www.plus.net [212.159.8.2]
Trace complete.
But what is significant to me is the one's that don't respond - remembering I've set the timeout to 10 seconds with -w 10000:
Tracing route to portal.plus.net [212.159.8.2]
over a maximum of 30 hops:
  1    <1 ms    <1 ms    <1 ms  my.router [192.168.1.1]
  2    42 ms    41 ms    42 ms  lo0-plusnet.pte-ag2.plus.net [195.166.128.72]
  3    54 ms   206 ms   215 ms  ge0-0-0-504.pte-gw1.plus.net [84.92.4.89]
  4    41 ms    41 ms    41 ms  te2-4.pte-gw2.plus.net [212.159.1.102]
  5    41 ms    41 ms    40 ms  ae0-102.ptn-gw02.plus.net [212.159.1.105]
  6    42 ms    42 ms    41 ms  gi0-1-31.ptc-gw1.plus.net [195.166.129.3]
  7    49 ms    49 ms    50 ms  pos1-0.pih-cr1.plus.net [195.166.129.250]
  8    50 ms     *       50 ms  vlan8.pih-gw4.plus.net [212.159.0.30]                     <<<<<<<<<<<<<<<<<<<<<<
  9    50 ms    50 ms    48 ms  if25.pih-lb04.plus.net [212.159.0.18]
10    49 ms    50 ms    50 ms  www.plus.net [212.159.8.2]
Trace complete.
C:\Users\Neil Gardner>tracert -w 10000 www.plus.net
Tracing route to portal.plus.net [212.159.8.2]
over a maximum of 30 hops:
  1    <1 ms    <1 ms    <1 ms  my.router [192.168.1.1]
  2    55 ms    40 ms    42 ms  lo0-plusnet.pte-ag2.plus.net [195.166.128.72]
  3    41 ms    42 ms    42 ms  ge0-0-0-504.pte-gw1.plus.net [84.92.4.89]
  4    41 ms    41 ms    41 ms  te2-4.pte-gw2.plus.net [212.159.1.102]
  5    40 ms    41 ms    40 ms  ae0-102.ptn-gw02.plus.net [212.159.1.105]
  6    41 ms     *       42 ms  gi0-1-31.ptc-gw1.plus.net [195.166.129.3]                            <<<<<<<<<<<<<<<<<<<<<<<<<<<<
  7    49 ms    48 ms    48 ms  pos1-0.pih-cr1.plus.net [195.166.129.250]
  8    49 ms    52 ms    50 ms  vlan8.pih-gw4.plus.net [212.159.0.30]
  9    50 ms    49 ms    50 ms  if25.pih-lb04.plus.net [212.159.0.18]
10    51 ms    49 ms    50 ms  www.plus.net [212.159.8.2]
Trace complete.
The two traces above were one after another, and show a greater than 10 second delay in server response.  I recognise the limitations of tracert tests, but I am seeing a *lot* of high latency / dropped responses in the tracerts within the plusnet infrastructure, which does not seem to be right.  Your thoughts on the tracerts would be appreciate, and I'll do some wiresharks tests in the meantime.
Kind regards, Neil
P.S. Just to add, it may take sometime before I can complete the wireshark tests, since I'm having to download 14MB at only 5kb/sec !!!
andyfuk
Dabbler
Posts: 11
Registered: ‎21-06-2009

Re: Severe speed/connection problems

Neil,
I had the same problem running the BT speedtester: I found it doesn't like Firefox, try IE instead if you really want to run it.
And it's a Java application, so no wonder it's flakey!
Andy
kjaerligkatt
Grafter
Posts: 411
Registered: ‎02-09-2007

Re: Severe speed/connection problems

Thanks Andy - I too use Firefox, so will try IE.
Cheers,  Neil
adie:quote
kjaerligkatt
Grafter
Posts: 411
Registered: ‎02-09-2007

Re: Severe speed/connection problems

OK, so after 2 1/2 hours, I have finally downloaded Wireshark - that is how bad my download speed is!!!
I tried to attach are a couple of Wireshark logs, showing a quick browse to the PlusNet website, BBC website and then a second log browsing to speedtest.net and performing a download test, but the attachment types are not allowed - what do you want me to do with the logs?
Download speeds are still around 300-350 kb/s, although uploading is fine.  I'm presuming that you will be wanting to check traffic prioritisation marking, which to me looks to be ok.
Further to my previous reply, I'm still seeing a lot of tracert timeouts when doing a tracert to www.plus.net, so entirely within PlusNet infrastructure - is this to be expected?  Could it relate to the severe performance degradation I've seen for the past 24hrs?
James suggested that is might be the adsl modem/router, which is of course plausable - but I'm reluctant to buy a replacment and find that the problem continues.  I can't borrow another modem anytime soon, and so would like to exhaust all possibilities first.  Is there anything else I can check at my end.
I finally got the btspeed tester to run, once I used IE, and it reports 210kbs !!!!
Any suggestions gratefully received.
Regards,  Neil
kjaerligkatt
Grafter
Posts: 411
Registered: ‎02-09-2007

Re: Severe speed/connection problems

The BT speedtester has been much more reliable this morning, and I was able to get it run through all 3 tests.  The result was:
"This Last Test comprises of Best Effort Test:  -provides background information.
    Your DSL connection rate: 7616 kbps(DOWN-STREAM),  448 kbps(UP-STREAM)
    IP profile for your line is - 6500 kbps
    Actual IP throughput achieved during the test was - 117 kbps
Your service was found to be performing poorly. Please raise a fault with your service provider, stating that the BT Performance Tester tool indicates poor service throughput performance after the third test."

As per my message of last night, what do you want me to do with the wireshark logs, as these cannot be attached to a forum post?  Given the final 2 BT tests bypass the PlusNet infrastructure, I'm guessing that if you just want the wireshark logs to check how the packets have been flagged for traffic prioritisation, then you will no longer need them.
Kind regards,  Neil
James
Grafter
Posts: 21,036
Thanks: 5
Registered: ‎04-04-2007

Re: Severe speed/connection problems

Thanks Neil.
Can you try attaching them to your ticket?  If they do look fine (which we'll be able to see), I'll then need to look at sending out a loan router for you.
It is a fairly bizarre problem though!
kjaerligkatt
Grafter
Posts: 411
Registered: ‎02-09-2007

Re: Severe speed/connection problems

Thanks James.
I have now opened a support ticket with the logs attached.  No: 29207974
Kind regards,  Neil