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I have Ubuntu 10.04 server up and running in my home network. Recently discovered that if I connect my notebook directly to modem, I am able to get 1.0 - 1.1MByte/s download speed. But if I connect the same notebook to server LAN port, then I get 0.8 - 0.9MByte/s download speed. Server hardware is more than powerful (i5 CPU with 4GB RAM) and I am not running any special services on it, basically it acts only as router. I have iptables without any traffic shaping.

How can I find where the bandwidth is lost?
Let me know what additional information is required to track this issue.

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The loss as I see is not very significant. It could be sporadic. Have you measured over a long time/multiple times? –  Ketan Nov 17 '12 at 13:54
    
Yes, number of hours, even tried to plot data. Not going above 0.9. I'm facing this issue for couple weeks, so have been monitoring it long time. –  Pablo Nov 17 '12 at 14:04
    
Which speed do you get when you test the speed from the server? In other words, is it the server which establishes a slower connection to the Internet or the connection from laptop to the server? –  Hennes Sep 7 '13 at 15:26
    
The speed I get from server is same that I get when connecting laptop to server. It's server that establishes a slower connection to Internet, not connection from laptop to server. –  Pablo Sep 7 '13 at 15:28
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