[ubuntu] networking problems

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http://ubuntuforums.org – i have ubuntu 9.10 and my network speed drops and then goes back up again. this is not my internet connection as i have the same problem on over 3 different internet isps i have also tried different download sources this even happends on my lan what can i do to fix this ?? i have attached a screen shot Attached Images Screenshot.jpg (71.8 KB) (HowTos)