ADSL Slow Downloads

From ExeWiki
Jump to: navigation, search

Fixing Slow Download Problems

If you are not getting the expected speeds from your Exetel ADSL service the reason(s) are almost certainly going to be with some aspect of your modem or computer set up. However if that is not the case then you will need to provide Exetel with some very specific information so that we can help you resolve the problems in the shortest possible time.

In order to obtain vital local conditions with your circuit, please carry out the checks listed below and then, if your speed problems persist, please email Exetel the information specified when you lodge an ADSL Slow Speed fault.

Before carrying out any of these actions please do the elementary checking required to eliminate the most common configuration errors that cause slow or variable speeds.

Tick.png Ensure you are not uploading/downloading with any applications like p2p and ensure you are not using any software that does rate limiting etc. If you are, then you are saturating your service, hence slow speeds.

Tick.png Ensure you have the correct Exetel DNS servers of:


Tick.png Turn off any firewall you have in operation

Having done this elementary checking please do the standard isolation test to eliminate any faulty hardware or cabling.

Isolation Test

Please find instructions for Isolation Test here.

Tick.png Having satisfied yourself that you have no mis-configurations in your hardware connections you should check that your computer hasn’t picked up a virus. While you may think that you have kept your virus scanner fully up to date and run it frequently there is always the possibility that you may have picked up a virus. Apart from running a full virus scan (which you should do before reporting any slow speed fault) you can use one of the standard Windows tools to visually check on whether your slow speeds are caused by a virus.

To check if that is what is causing your computer or internet access to seem slow, you can determine the network activity of your Windows computer by following the instructions below:

1. press the Ctl-Alt-Delete keys. This cause the Windows Task Manager window to pop up on your desktop. Then select the Networking tab


2. Click on View on the top menu bar and select Network Adaptor History and select Bytes Sent, Bytes Received and Bytes Total so that they are all checked


3. You can now see the data traffic being sent and received by your computer


Notice in this example how the Red line (Bytes sent) is very high, while the Yellow line (Bytes received) is low. This means the computer is sending a lot of traffic to the internet and receiving very little.

If your computer shows this pattern and you aren’t running any programs that would account for the traffic, and you know you aren’t uploading files to the internet, then there is reasonable chance your computer has a virus and that is affecting your internet speed.

You need to download a new version of your preferred virus scanner and run a complete scan of your computer

Speed Tests

Having done the isolation test and having established that there are no other devices or faulty cables affecting your ADSL connection, reconnect to the ADSL and do the speed tests found described below: Go to or and run the speed test.

For ADSL, the optimal speed test results should be (as 15% is used for protocol overheads):

256/64 line speed, between 180-230 kbps

512/128 line speed, between 380-440 kbps

1500/256 line speed, between 1000-1350 kbps

Then do a few PING and TRACERT tests from 2 domestic and 2 international locations.

If this speed test does not give you a result close to the optimum then you will need to email Exetel to get further assistance in solving your speed problems. To enable Exetel to help you we will require you to carry out the following tests:

PING and Traceroute

These two steps do reveal some very vital network conditions from your ADSL service to the Internet. For an experienced network engineer or staff member, this provides clues and/or an initial insight.

First, open up your e-mail program, and create an e-mail. Minimize the e-mail, as we will be using it soon to save our PING and Traceroute text in to.

To do a PING test with Windows XP

  • Click on START (bottom left hand corner on your screen)
  • Click on Run
  • Type in cmd

When a black MS-DOS black screen appears, type; ping then press enter

Save the results, by cut and pasting into the body of an e-mail (see below how to cut & paste)

To do a trace route test with Windows XP

  • Click on START (bottom left hand corner on your screen)
  • Click on Run
  • Type in cmd

When a black MS-DOS black screen appears, type; tracert then press enter

Save the results, by cut and pasting into the body of an e-mail

To cut and paste, from the MS DOS screen

Click on the top left hand corner of the MS DOS screen

From the drop down menu, choose ‘Properties’

Check the box ‘quick edit mode’

Now, depress the left mouse button at the beginning of the text you wish to copy from the MS DOS screen and drag across to the bottom of the text. The text should be highlighted white.

Now right mouse click once. This seems not to do anything, however it does, it has just ‘cut’ the text.

Now click inside the body of your e-mail and press the ‘control’ and ‘v’ keys together on your keyboard, or right mouse click and select ‘paste’. This ‘pastes’ the text you just highlighted into the e-mail.

Demonstrating what PING and Traceroute looks like


C:\Documents and Settings\Owner>ping

Pinging with 32 bytes of data:

Reply from bytes=32 time=13ms TTL=61

Reply from bytes=32 time=7ms TTL=61

Reply from bytes=32 time=6ms TTL=61

Reply from bytes=32 time=7ms TTL=61

Ping statistics for

Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

Minimum = 6ms, Maximum = 13ms, Average = 8ms


C:\Documents and Settings\Owner>tracert

Tracing route to [] over a maximum of 30 hops: 1 1 ms 2 ms 2 ms

2 12 ms 7 ms 7 ms []

3 7 ms 7 ms 7 ms []

4 8 ms 8 ms 7 ms []

5 8 ms 8 ms 8 ms []

6 8 ms 8 ms 8 ms []

7 8 ms 8 ms 8 ms []

8 8 ms 8 ms 8 ms pitt-tcom-r01 []

9 9 ms 8 ms 8 ms

10 * 9 ms 8 ms

11 21 ms 7 ms 7 ms

Trace complete.

If, having carried out the checks and having done the isolation test your speeds are not close to the optimums for your line type then please visit the Exetel forums for slow speeds:

ADSL 1 Slow Speeds –

ADSL 2+ Slow Speeds –