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I have two PCs on my network; one is a Windows 7 PC and the other is running Ubuntu 12.04.

My PC is the one with Ubuntu and it is slowing down the network not only for me but for my husband as well.

I have used iftop to check out the network traffic and there is none, yet speed tests show that when my PC and only my PC is connected, the speed goes down significantly for both of us.

I need help troubleshooting this further because I have never seen anything like this before...

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closed as too localized by Luis Alvarado Jun 17 '13 at 18:59

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. If this question can be reworded to fit the rules in the help center, please edit the question.

Hey I have fixed this somewhat by turning QoS on. However, I would still like to know how Ubuntu was affecting the entire network. :) –  xjonquilx May 10 '12 at 3:17
Does the (lack of) network activity reported in iftop match what you see when you look at the "blinking lights" for network activty on your ethernet connections or router display? Are you using wired connections or wi-fi? If wi-fi are you both using the same wireless protocol? i.e. both 802.11g or both 802.11n? –  irrational John May 10 '12 at 22:44
No, it doesn't match up, the lights are blinking even though iftop reports no activity. We are both using wireless N wifi. I tried disabling wireless N to see if that was the problem, but the same thing still happened. –  xjonquilx May 11 '12 at 12:00
Any chance you could at least temporarily disable wireless and connect both computers with a wired connection just to rule out whether the problem has anything at all to do with wi-fi? Have you verified the performance problem using one of the Internet speed sites? –  irrational John May 11 '12 at 15:22
Yes, I verfied the problem using speedtest.net. I haven't tried a wired connection yet but you're right... I need to do that. I will try it and let you know what happens. Thanks! :) –  xjonquilx May 11 '12 at 21:58