Re: DSL connection
- From: Chuck <none@xxxxxxxxxxx>
- Date: Sun, 26 Feb 2006 17:34:13 -0800
On Sun, 26 Feb 2006 15:37:27 -0800, Guidence-Seeker
<GuidenceSeeker@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
"Chuck" wrote:
On Wed, 22 Feb 2006 16:32:27 -0800, Guidence-Seeker
<GuidenceSeeker@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
I hope this is the correct discussion group as I was directed here from
another. I have a Compaq SR1230NX Presario, AMD 3200+ Athlon XP, 1 gig Ram,
an A7V8X-LA motherboard, a Speedstream 5100 modem, running XP Home Edition
OS. There are no routers and this is the only connected computer.
I originally had the system connected with a DSL download rate of 1.5 Mbps
(maximum) that realistically gave me about 1.2Mbps dowload speed. I feel
that was logical for the time loss in the modem transfer. I more recently
upgraded to a different speed (3.0 Mbps maximum) from the same ISP. When we
first ran a speed check after the ISP supposably had made the new connection
all that could be obtained was 1.4.
I called the ISP to investigate the problem. After much wrangling they
finnally replaced a card or two on their side and got the rate up to 2.4
through my modem and into their technician's laptop. When the cable was
connected to my CPU (an on-board NIC) all we could get was a 1.9 download
rate and the connection seemed to be slugish at times. I don't have any
security systems that would interfere with the signal and I purchased a
10/100 PCI Dynex DX-E101 NIC. I installed the new NIC and tested the rate
several times after rebooting the system. I went through the Control Panel -
Network and made sure it saw the card and there were no conflicts.
Does anyone have any suggestions on what might be done to correct this, or
is there some hardware restrictions that won't allowa faster rate? Have I
provided enough information to make an assesment? I appreciate any
assistance in advance.
How are you testing your download speed? Are you using the same tool /
destination server that the ISP tech used?
You state that you have no router, nor any security systems that would interfere
with the signal. Which means that you don't have any security to protect you
from malware. I recommend:
# Setup a layered defense for your computer.
<http://nitecruzr.blogspot.com/2005/05/please-protect-yourself-layer-your.html>
http://nitecruzr.blogspot.com/2005/05/please-protect-yourself-layer-your.html
# Check thoroughly for malware.
<http://nitecruzr.blogspot.com/2005/05/dealing-with-malware-adware-spyware.html>
http://nitecruzr.blogspot.com/2005/05/dealing-with-malware-adware-spyware.html
After you do that, we can look for stable and reliable ways of measuring your
download speed.
Chuck:
First and foremost, I appreciate your response.
The method of testing the speed was using the same server as the ISP did
with his laptop. It was bookmarked for that very reason.
It is true there is no router and I will probably attain one within the next
few days. There may be a misunderstanding about the security system I spoke
about. What I meant was our home is not protected by a home security system.
The ISP state that many of those sytems send out high frequency waves that
interfer with their DSL connection. I have Norton and other security
programs for firewall, worm, spyware etc. in place for the computer.
Thanks again,
Bob
Bob,
Anyway, hoping that you are still listening, I have 2 additional bits of advice.
1) The computer that you use does not, necessarily, have to be the same type
(desktop vs laptop) and / or CPU speed etc.
2) There are 2 key tuning elements that you may need to be aware of. These are
not unique to Windows XP, so I did not think of their relevance until just
recently.
# MTU. The maximum size of an individual packet that the distant server can
send to you.
# RWin. The size of the receive buffer (where multiple incoming packets are
stored), which your computer will let fill up until it sends a reply to the
distant server saying "Send more data".
I would bet that the technician's laptop was tuned to the correct MTU and RWin,
to allow a maximum transfer rate of the test file, giving him a favourable test.
I discuss MTU in my article.
<http://nitecruzr.blogspot.com/2005/06/internet-connectivity-problems-caused.html>
http://nitecruzr.blogspot.com/2005/06/internet-connectivity-problems-caused.html
Tuning the RWin is something that I haven't done so often, but you can change it
using DrTCP (as used for changing the MTU). You will find a tool for
recommending an RWin change on the DSLR website, where you get DrTCP.
<http://www.dslreports.com/faq/2014>
http://www.dslreports.com/faq/2014
Please try tweaking both MTU and RWin before moving to another computer. I
suspect that both (or either) could have an effect on your situation.
I still recommend a malware examination though.
--
Cheers,
Chuck, MS-MVP [Windows - Networking]
http://nitecruzr.blogspot.com/
Paranoia is not a problem, when it's a normal response from experience.
My email is AT DOT
actual address pchuck mvps org.
.
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