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Distribution: Manjaro and CentOS at work, Ubuntu at home
Half bandwidth over wireless
I'm experiencing something kind of weird.
When I test my network speed (Speakeasy and speedtest) I get about 25/25mbps. Internally however although unmeasured it seems to be full 100mbps. Other computers and devices on wireless are getting about 50/50 mbps on the same tests. The problem is definitely specific to this laptop and specifically outside the local network.
Distribution: Arch, CentOS, Fedora, OS X, SLES, Ubuntu
You say the problem is definitely specific to that laptop, and specifically outside the local network. How have you tested internal network speeds using that laptop in comparison to the other devices present? Large file copies to the same local server/machine? If so, does the local internal network speed of that laptop also seem to suffer in comparison to the other wireless devices, or is it very much within the performance range of the others?
If the laptop seems in-line with all the other wireless devices for local network speeds and functionality then I would start investigating potential issues due to differences in software configuration between that laptop and the other devices; are the other devices also running linux, or are they running Windows etc.?
I ask this as I believe the SpeakEasy speedtest utilizes Flash, which Adobe sorta abandoned on the linux platform a while back (I think it remains at 11.2). There very well could be some differences if the laptop in question is running the test using an old version of Flash through Firefox on Ubuntu compared to the other devices running Windows with current versions. (Using Chrome, which integrates current Flash builds into the browser, should solve at least that part, though--that's the easiest way to have current Flash versions on linux computers)