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I have a ubuntu 12.04 server that seems to use all available bandwidth on a server once I start a download. I have tried limiting through the limit options on available commands and I have also tried using wondershaper and trickle. Again even when I have put the limits in place the bandwidth usage maxes out. Does anyone know why this happens? I can verify that it happens when using wget, sftp and ftp.

As a side note, the download speed never goes higher that 1.00mb/s even if it uses all the bandwidth.

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Welcome to Ask Ubuntu. What is wrong with this behaviour of the server? It's difficult to determine what you want to know. –  Uwe Plonus Jul 1 '13 at 14:04
Thanks for the welcome. I'm trying to determine if this is the correct behaviour. I shall try to be clearer. When I perform a download the server uses all available bandwidth (roughly about 10 mb/s). This effectively knocks out any other network functionality. –  Arekku Jul 1 '13 at 14:43
do you need other bandwidth at the moment the download runs? If not then I see no problem. You only have a problem is other network service during download stop to work. –  Uwe Plonus Jul 1 '13 at 14:45
It actually grinds all network traffic to a halt. So any day to day use in the network (browsing the web etc.) is unusable. It only seems to be once I started a download. So far we are scheduling the jobs to run overnight /weekend but the files are getting larger so this wont be an option in time. It wouldn't be so much of a problem if the sudden bandwidth was in correlation to the download speed as I could throttle the download speed. –  Arekku Jul 1 '13 at 14:52
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