Slower and Slower
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Slower and Slower
10-06-2007 7:47 PM
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When I first changed 8mb broadband, my modem would connect at around 6.5 - 7.2mbps and my speed-tests came back around 3500kbps. I could achieve download speeds of 420kbps. After a few months the connection speed averaged 4.7mbps and the speed-tests about 2000kbps and more usual to be around 1500kbps. Average download speeds are around 230kbps. Same as I was getting on the 'old' 2mb service!
I also started having problems with 'dropping' the line. Usually meant I had to restart my modem.
Up until last week, I was using a Binatone ADSL 500 USB modem. I thought that it might be the cause of my problems.
Now I have a BT Voyager 210 ADSL Router. It reports that its' speed is 7mbps yet my speed tests are getting slower!!
Today, one speed test came back at 225.4kbps!!!
I still have the problems of the line dropping, slow surfing and 404 error messages.
Any advice?
########################
Laugh and the world laughs with you....
Snore and you sleep alone
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Re: Slower and Slower
10-06-2007 10:00 PM
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The RWIN/MTU settings might need changing. Running the tweak tester at DSLreports and posting the results URL you'll be given back here would help the community provide further advice. Persistence is sometimes needed to get on this site at busy times.
Please also post your router stats (sync speed, noise margin and attenuation, downstream and upstream). Are you on LLU or BT IPstream?
Do the 404 messages just occur on a small number of websites (Microsoft, Ebay, …)?
Regards
David
Re: Slower and Slower
11-06-2007 5:50 PM
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http://www.dslreports.com/tweakr/block:36871a5?service=dsl&speed=2000&os=winXP&via=normal
I have implemented the recommendations and my last speed test come back as 3086kbps....... nearly twice as fast as before. So far, have not experienced any hang-up, slow webpages or 404 errors.
However, I was not able to enable 'pinging'. Can't find how to do it in my Security software. (Trend Micro PC-cillin Internet Security 2007)
DAVE
Re: Slower and Slower
12-06-2007 12:05 AM
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The RWIN value you originally had (17520) is the Windows default which is great for those working on WANs with 2ms pings - i.e. almost none of us. The DSLreports recommended maximum would probably have been higher if you'd put in a download speed of 8000, which is the advertised maximum for your line. I use a value around 100,000 (the system rounds it to an even multiple of MSS (=MTU-40)).
You might have more speed to come with a little more tweaking. I suggest doing another run on DSLreports with the new settings. Please post the url with updated results here. Also your router stats can provide helpful information. If you are unsure how to get these this site will help.
Regards
David
Re: Slower and Slower
12-06-2007 10:15 AM
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The results for the new settings are:-
http://www.dslreports.com/tweakr/block:430a226?service=dsl&speed=8000&os=winXP&via=normal
Speed test with new settings came back at 4915.2kbps - fastest its ever been - giving a download speed of 610kbps. More than I usually need.
As to the 'pings', I think I'll remain invisible for now.
A great site Shields Up! https://www.grc.com/x/ne.dll?bh0bkyd2 is great to check your computer's vulnerability to outside attack.
With my own security software I was still visible on some ports, but with [shadow=red,left]Plusnet's[/shadow] firewall in place as well, I am now in complete 'stealth' mode
One more question.....is it better to leave a router switched on?
Thanks for all your help
DAVE
Re: Slower and Slower
12-06-2007 7:22 PM
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That's a big improvement, more than I thought you might see. Increasing MTU (Maximum Transmission Unit) might give you a little more, but staying with the present settings for a while to verify your connection remains stable is suggested.
I'm sure others would find a visit to the ShieldsUp! website you mentioned helpful for checking the "stealthiness" of their system.
Whether routers should be left on is a matter for personal preference. For convenience I leave mine on 24x7, but if you use your computer for a relatively small part of the day turning the router off saves a little electricity. The thing *not* to do is turn the router off and back on repeatedly over a period of 30-60 minutes. The monitors are likely to view this as an unstable line and increase noise margin (reduce sync speed) to try to stabilise it.
Hope this helps.
Regards
David
Re: Slower and Slower
12-06-2007 7:54 PM
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Since I discovered this I have generally switched my router off when I've finished with the computer for the day - about 7-8pm in the evening and switched it back on about 8am each day. As a result my IP profile has gone up to 4000kbps.
Maybe the "noisy rush hour" is quite different on other folks' exchanges but this night time switch off works for me.
regards
Tony
Re: Slower and Slower
13-06-2007 7:59 PM
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My router seems to be stable at 7000kbps most of the time. Have taken to switching it off overnight and this has improved my sync speed. This has put my IP profile up to 6000kbps from my previous 4000kbps.
I have really noticed a lot of difference in quality and speed.
DAVE
Re: Slower and Slower
13-06-2007 10:29 PM
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Re: Slower and Slower
28-06-2007 9:19 PM
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I have checked the adsl test :-http://www.dslreports.com/tweakr/block:2bd4f3e?service=dsl&speed=8000&os=winXP&via=pppoA
and since reduced the default 1500 MTU to the ping result recommendation of 1492. My RWIN is set to 185816 as against a calculated figure 166000 for 8Meg service max. ( perhaps a bit high?)
I believe the reduction in service is not due to any change of circumstances at my end, indeed I had made some improvements to get up to the 6000 kb/s margin. What can Plus/BT do to improve my speed? I would appreciate your assistance and explanation.
Re: Slower and Slower
28-06-2007 11:43 PM
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Some of your settings are not ideal, Path MTU Discovery should be set to Yes and Time Stamping should be set to No.
The upload MTU of 576 needs to be the same as the download value; this might be fixed by turning on Path MTU Discovery.
The ball-park figures I have for 50-60db attenuation suggest a line capability of 4M; has attenuation increased since before Christmas when you mentioned getting 6M? A noise margin of 18db suggests you should achieve a much higher sync on reboot, but the frequent loss of connection (I assume this is LCP down) suggests you are having bouts of noise. Have you noticed noise margin reducing at these times?
Finally have you done tests with the modem plugged into the test connection behind the master socket to eliminate any effects from your internal wiring? Also tried a different microfilter? And a different router if possible?
David
Re: Slower and Slower
30-06-2007 3:45 PM
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Quote from: Walter
and since reduced the default 1500 MTU to the ping result recommendation of 1492. My RWIN is set to 185816 as against a calculated figure 166000 for 8Meg service max. ( perhaps a bit high?)
I believe the reduction in service is not due to any change of circumstances at my end, indeed I had made some improvements to get up to the 6000 kb/s margin. What can Plus/BT do to improve my speed? I would appreciate your assistance and explanation.
With an attenuation of 50dB 6000kbps is a very good speed. I don't think it's going to get any better than that. That's above what I would expect for that line length.
The reason for the earlier drops in speed is likely signs of instability. At that speed the line is sync'ing as I say higher than I would expect so there's probably a bit of noise or something that causes it to decrease down to what would be a more usual speed for that length of line.
Probably not a lot that can be done other than checking all the wiring and filters.
The RWIN is probably a bit on the high speed. For a speed of 6Mbps and MTU of 1492 I'd recommend 87120.
[moderators note by Daniel (assos) fixed BBcode for you]
Enterprise Architect - Network & OSS
Plusnet Technology
Re: Slower and Slower
24-07-2007 7:37 PM
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Here are my present figures:-
Line Rate 3744 Kbps 448 Kbps
Noise Margin 15.9 dB 19.0 dB
Line Attenuation 53.0 dB 29.0 dB
I have not found any difference when plugged into the mail socket which I have been for the last 6 Months but tonight I'm using the extension trying out Plusnet 'freeby'
Re: Slower and Slower
24-07-2007 7:41 PM
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Your help appreciated.
Re: Slower and Slower
24-07-2007 11:19 PM
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In connection with sync speeds, it's possible that the exchange monitoring equipment (DLM) has increased your target noise margin above the normal setting of 6db to try to stabilise and reduce transmission errors on your line. The best way to check the target noise margin is to note the value shown by the router stats immediately after restarting the router. That value should be close to the target noise margin. Please let us know the value.
David
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