ADSL problem high sync speed poor throughput

Hi EE,

I have a client which recently moved offices and their ADSL line throughput seems very poor. We get 0.6 mbps download speed and 0.4 upload. The sync speed is fine at 6mbps, we tried changing ISP however no problems found with the line. The router has been changed and we had an ISP engineer check the line twice and no faults reported.

What else could it be? Any ideas? Thanks
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Nolan GustavoAsked:
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IT-Monkey-DaveCommented:
Make sure every network port under your control, right up to the DSL modem, is truly running Full Duplex, not Half Duplex.
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pgm554Commented:
Before we get into finger pointing,run this and post results:


http://netspeed1.stanford.edu:7123/

ISP engineers are as good as the company that sends them out,and with that being said,if it's from the provider,they don't know their butt from their elbow.

THEY LIE!

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Nolan GustavoAuthor Commented:
TCP/Web100 Network Diagnostic Tool v5.5.4a
click START to begin

** Starting test 1 of 1 **
Connected to: netspeed1.stanford.edu  --  Using IPv4 address
Checking for Middleboxes . . . . . . . . . . . . . . . . . .  Done
checking for firewalls . . . . . . . . . . . . . . . . . . .  Done
running 10s outbound test (client-to-server [C2S]) . . . . . 624.0kb/s
running 10s inbound test (server-to-client [S2C]) . . . . . . 1.77Mb/s
Your PC is connected to a Cable/DSL modem
Information: Other network traffic is congesting the link
 [S2C]: Packet queuing detected
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Nolan GustavoAuthor Commented:
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Nolan GustavoAuthor Commented:
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Nolan GustavoAuthor Commented:
For some reason I am unable to copy as text so attached screen shots
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pgm554Commented:
The Stanford test is pretty accurate and even though there is packet loss,it's no where near the stats you report.

Where are you getting the .6 and .4 from?
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Nolan GustavoAuthor Commented:
Hi pgm554, I have been running some more tests today and found that on certain speed tests such as speedtest.net and broadbandspeedchecker the speed is capped at 0.6 but on others I manage to achieve 4mbps download. I am not sure why I can see such difference from using different tool as these sites work fine if I run them anywhere else. Just to be certain I removed QOS but it made no difference.
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pgm554Commented:
I've seen,depending upon the time of day or after dusk,ADSL speeds go bad.

The dirty little secret that AT&T neglects to tell you is that after dusk ,they turn up the frequency of the T1's and the crosstalk affects the DSL folks,making for a very poor experience.

As for your issues,they could be using bandwidth shaping and your mileage may vary accordingly.

That the reason DSL is often slower than a business T.
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IT-Monkey-DaveCommented:
The LAN ports on our Qwest/CenturyLink DSL modem-router default to half-duplex for some reason.  That kills the performance.  Make sure they're full duplex.
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Nolan GustavoAuthor Commented:
Problem was with a a linux firewall which i was not aware of, there was QOS applied on certain types of traffic.
Thanks and apologies for delay with replying.
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