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Old 06-05-2015, 09:00 AM   #1
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Fedora desktop slows internet for entire network


My desktop PC is running Fedora 20. I don't usually leave it on when I am not using it, but I needed to ssh into it for a few days so it ran continuously for 3 or 4 days (I actually never ended up using it via ssh).

I noticed a few days into it that internet connectivity throughout my home drastically decreased, basically to non-existent. On occasion a page will load but it won't even load the whole way - most pages just time out. After fiddling with the router/modem I discovered that when I disconnect my Fedora desktop all computers/devices in the home are able to use the internet normally again. Another interesting piece of information is the desktop is dual-boot (Fedora / Windows 7). When I boot into Windows 7 the home network is fine, no problems. However when I boot back into Fedora (and connect to the network) the problems start again.

I was able to get nload on the Fedora machine and I noticed outgoing traffic appears to be constant when connected to the network - not an expert at deciphering this software though.

My best guess is I was SSH attacked and something is continuously transmitting data from my Fedora machine and dragging down the network - but again I am no expert in this arena.

So I've confirmed my Fedora setup is the issue - it is not an ISP issue or router issue or desktop hardware issue - it is something going on solely in the Fedora OS. Any thoughts on what is happening here? Or better yet, how do I fix this? All input is greatly appreciated!

EDIT: The desktop is wirelessly connected


Last edited by Gio; 06-05-2015 at 09:33 AM.
Old 06-05-2015, 11:47 AM   #2
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What does the traffic do? Slowly slow down? Slow down all of a sudden? After a while? How does the DHCP come into the game? Is every box on a dynamic IP address? Or are there some on a static one?
What does the modem do? Is it old?
Check the network traffic...maybe there are requests that dont time out...
Random thoughs, dont shoot the dreamer read the post "diagonally"...
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Old 06-05-2015, 12:03 PM   #3
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play with netstat

man netstat
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Old 06-05-2015, 04:37 PM   #4
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first things
in 19 DAYS !!! Fedora 20 goes END OF LIFE

time to upgrade to 22

mind you there are a ton of NEW changes in 22 so READ the release notes
yum is deprecated and 22 is using DNF now
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Old 06-05-2015, 09:17 PM   #5
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If (like me) you use yum out of habit and are still coming to terms with dnf, just alias it to get rid of the nag messages.

For the network monitoring I like iptraf (now iptraf-ng) for quickly eyeballing traffic usage.
As for back-level Fedora, I tend to keep one system a couple of releases back - updates keep coming. None have gone up in smoke yet. But yes, you do have to stay on top of the Fedora releases.


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