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# 251043 5-Jun-2019 22:15
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I am working with a firm in Germany,


They have given me access to a VPN so I can copy some CAD files to their server. Its realllllllllly slow......




When I run an ookla speetest from my Windows10 machine to the server in the subject I get 3Mbps upload....




When I do  speedtest with ookla via my Galaxy S10+ I get  133Mbps upload....




All with the same router....




Im at a loss why there would be a difference.... I even tried the laptop with a wired connection, same speed....




Anyone have any ideas?

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  # 2252576 5-Jun-2019 22:20
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Spark Fibre 100 (testing over wifi)


Ping 299


Down: 19.51


Up: 4.63

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  # 2252578 5-Jun-2019 22:21
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Looks like my VPN is just going to suck....LOL!


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  # 2252619 5-Jun-2019 22:26
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  # 2253979 7-Jun-2019 17:22
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TCP acknowledgements.


Every packet sent requires an acknowledgement to comes back with a CRC check to confirm it arrived correctly. 
During times of congestion, the acknowledgements dont come back correctly and therefore the TCP protocol can self-limit itself to stay under the speed capacity of the pipe.

The TCP protocol has a windowing function where it will send a number of packets but still requires the acknowledgements of the first one to come back before it will send anymore. This helps ramp up speed over medium distances or latency. 


When sending packets along a long distance with lots of latency, the acknowledgements come back from each hop along the path. This allows the transfer speed to run much faster because its probably only waiting for an acknowledgement from auckland a few ms away before it sends the next packet. 


If you wrap your TCP connection inside a VPN emulating a layer 2 pipe from end-to-end where the packets aren't being acknowledged at each hop along the path, then each acknowledgement takes a long time to come back from the other end and your throughput will be incredibly slow. 


It only takes a few milliseconds to create a dramatic effect on TCP throughput performance. 

Ray Taylor
Taylor Broadband (rural hawkes bay)

There is no place like localhost
For my general guide to extending your wireless network Click Here

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  # 2254024 7-Jun-2019 18:42
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Speedtest is utterly crap now. On mobile I get around 150Mbit down, 50Mbit up there where Desktop I’m hardly able to break 50Mbit.

Don’t trust Speedtest. It just isn’t good when there is distance involved. Ray answered the ultimate question perfectly.

Edit: testing to the wrong destination. Here is my mobile result (2degrees):

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  # 2254100 7-Jun-2019 20:28
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For what it's worth, on a 100/20 connection:


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