Slow downloads speeds after re install

[AORman]

Is it just me or has anyone else noticed slow speeds?
I have had to re install my OS and everything else over the last few days and noticed my download speeds are terrible to what I was getting here.
I am now only getting just over 2mb/sec, no matter what tweaks I do.
My upload speed is fine at around 384Kb/sec.

Oh, what should the MTU be set at, as I have mine set at 1500, but also tried 1472 and that only improved the latency.

Thanks

[Paul_ADSL24]

It may be a coincidence. Can you please post your router stats and if possible the results of a test from http://speedtester.bt.com

[AORman]

What is my login for the site because it doesn't recognise my adsl24 login.
Also how do I get my router stats up as it is a Billion ADSL2 router.

Oh, out of interest I ran the ping cmd to adsl24 to find the largest MTU and the largest figure with out the 'packet needs to be defragmented' message was 1440, so that would make the MTU 1468, which seems a bit low!

Thanks

[James]

Your login is the full usernaem you have in your router. So yourusername@adsllogin.co.uk etc

MTU should be 1478 or even 1500.

James

[AORman]

Just did a test on BT's speed test site and got this:

Test1 comprises of Best Effort Test: -provides background information.
IP profile for your line is - 7150 kbps
DSL connection rate: 448 kbps(UP-STREAM) 8128 kbps(DOWN-STREAM)
Actual IP throughput achieved during the test was - 4914 kbps

Then did a test on the speedtest.net site and the best I got was just over 2mb/sec.
If I was getting 4.9mb/sec I would be happy, but something doesn't seem right if the other site says only 2mb/sec

With my MTU at 1500 or 1478 I get this:
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.


C:\Documents and Settings\Robert>ping www.adsl24.co.uk -l -f 1500
Bad parameter 1500.

C:\Documents and Settings\Robert>ping www.adsl24.co.uk -f -l 1500

Pinging adsl24.co.uk [84.234.17.165] with 1500 bytes of data:

Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.

Ping statistics for 84.234.17.165:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

C:\Documents and Settings\Robert>ping www.adsl24.co.uk -f -l 1478

Pinging adsl24.co.uk [84.234.17.165] with 1478 bytes of data:

Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.

Ping statistics for 84.234.17.165:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

C:\Documents and Settings\Robert>

But when I lower the value:
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\Robert>ping www.adsl24.co.uk -f -l 1468

Pinging adsl24.co.uk [84.234.17.165] with 1468 bytes of data:

Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.

Ping statistics for 84.234.17.165:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

C:\Documents and Settings\Robert>ping www.adsl24.co.uk -f -l 1444

Pinging adsl24.co.uk [84.234.17.165] with 1444 bytes of data:

Reply from 84.234.17.165: bytes=1444 time=52ms TTL=56
Reply from 84.234.17.165: bytes=1444 time=52ms TTL=56
Reply from 84.234.17.165: bytes=1444 time=53ms TTL=56
Reply from 84.234.17.165: bytes=1444 time=52ms TTL=56

Ping statistics for 84.234.17.165:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 52ms, Maximum = 53ms, Average = 52ms

C:\Documents and Settings\Robert>ping www.adsl24.co.uk -f -l 1446

Pinging adsl24.co.uk [84.234.17.165] with 1446 bytes of data:

Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.

Ping statistics for 84.234.17.165:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

Comments??

[James]

You need to check what your MTU is currently set at. Run this: http://www.dslreports.com/tweaks and post back results

[mirage]

Finding the largest MTU

Reduce 1472 by 10 until you no longer get the "packet needs to be fragmented" error message, and then increase by 1 until you find the max command line number for ping.
Add 28 more to this (since you specified ping packet data size, not including a packet header of 28 bytes) AND THIS IS YOUR MaxMTU.

So if you ping bbc at 1472 without “Packet needs to be fragmented but DF set.” error message. Add 28 to the total 1472+28=1500

The MaxMTU you get using this method might very well be 1500, in which case, everything is pretty boring, and your MaxMTU must already be set ok, otherwise you could not get ping working up to 1472
Windows 2000/XP users:

Go to Start/ Programs/ Accessories/ Command Prompt and type the following:

ping -f -l 1472 www.bbc.co.uk

This method will not work if you have already set your MTU with drTCP you need to reset back to default windows setting 1500

mine works at 1402??? 1402+28=1430

[AORman]

Ok here are the results as requested. I set my MTU to 1472 before this test.
http://www.dslreports.com/tweakr/block:5b47509?service=dsl&speed=81920&os=winXP&via=pppoA

Here are the ping results: Am I confused or what??
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\Robert>ping www.bbc.co.uk -f -l 1472

Pinging www.bbc.net.uk [212.58.227.78] with 1472 bytes of data:

Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.

Ping statistics for 212.58.227.78:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

C:\Documents and Settings\Robert>ping www.bbc.co.uk -f -l 1462

Pinging www.bbc.net.uk [212.58.227.78] with 1462 bytes of data:

Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.

Ping statistics for 212.58.227.78:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

C:\Documents and Settings\Robert>ping www.bbc.co.uk -f -l 1452

Pinging www.bbc.net.uk [212.58.227.78] with 1452 bytes of data:

Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.

Ping statistics for 212.58.227.78:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

C:\Documents and Settings\Robert>ping www.bbc.co.uk -f -l 1442

Pinging www.bbc.net.uk [212.58.224.82] with 1442 bytes of data:

Reply from 212.58.224.82: bytes=1442 time=51ms TTL=246
Reply from 212.58.224.82: bytes=1442 time=51ms TTL=246
Reply from 212.58.224.82: bytes=1442 time=50ms TTL=246
Reply from 212.58.224.82: bytes=1442 time=50ms TTL=246

Ping statistics for 212.58.224.82:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 50ms, Maximum = 51ms, Average = 50ms

[Paul_ADSL24]

And note that simply changing the MTU in Windows won't have much effect unless you also change it on your router

[AORman]

My router is a billion BiPac 7202, and I don't know how to change it there.

[Paul_ADSL24]

From the web GUI go to Wan Connections, then click Edit for the connection listed and it's the bottom box.

The manual is available from http://www.billion.uk.com/esupport/index.php?_m=downloads&_a=downloadfile&downloaditemid=58 and I searched for MTU in the manual. See page 40

[AORman]

Thanks, I have changed it to 1472 now on the router, but download speed is still only about 2mb/sec!!!
And the largest value I can use before I get Packet needs to be defragmented but DF set is 1442

[mirage]

Many routers have a setting in which you can alter its MTU size. You can change this, but you must make sure that the MTU setting on your router is the same as on your PC.

It does not matter too much if the MTU on your router is higher than that on your PC, but the setting in your router must not be less than the MTU on your PC

Use Dr TCP to alter your pc MTU settings
Kitz is a good site to learn about tweaking your mtu

http://www.kitz.co.uk/adsl/tweak2.htm

[Paul_ADSL24]

I'm presuming you saved the settings and rebooted the router!

[AORman]

Yes I did thanks and I changed some other settings using cablenut against what was suggested on this site: http://www.j79zlr.com/cablenutXP2k.php

I then rebooted, did another speedtest on the Dublin server and got just a little over 6mb/sec, which I am very pleased about, although my uplkoad speed has dropped from 388 kb/sec to 234kb/sec, but I'll live with that for now.

Thanks