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Old 01-30-2008, 09:39 PM   #1
Registered: May 2007
Distribution: Kubuntu
Posts: 40

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Intermittent Internet connection Issues on Kubuntu


I just installed Kubuntu (the newest version stable I belive) on my Sony Vaio VGN FE890N/H Laptop computer. So for this has gone stunningly, however I think I have run upon a problem.

Every once in a while (perhaps 30 mins to an hour) the internet simply stops. The computer retains all of its IP settings, and the lights on my DSL modem betray no problem (I have no router between me and the internet). So far the only way I have found to fix this problem is the restart my modem. I have not had this problem under Vista (gah!) that I am aware.

Is there any way of diagnosing what is going wrong here? I know I probably haven't provided all of the info needed, but let me know how to get it and I'll do my best.


Old 02-01-2008, 09:20 AM   #2
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Since your configuration works most of the time, it would help if you could do some problem determination when it fails.

When you have a few minutes, and things are working, open a konsole and do some pinging. Know your IP address, and your configuration. Since you are connected to a DSL modem, you are probably running DHCP with your ISP. ( They assign an IP address ). Restarting the modem will cause a new address to be assigned. See if you can find out the IP addresses of the DNS servers your ISP provides. Try and ping them. Most of the ISP's I have dealt with allow pinging of their servers.

Not all ISP's use DHCP, there are some that assign you an IP address, and you have to configure it. If this is the case, try and ping that address when working, and when it fails. Post the results.

Some useful commands. In a konsole, '/sbin/ifconfig eth0' will list the current configuration of your ethernet card. I'm assuming this is hard wired, since you don't have a router. If it is wireless, then the name will not be eth0.

To restart your ethernet card, ( internal chip set ) try this. In a konsole 'ifconfig eth0 down' and then 'icfonfig eth0 up'
That will restart your ethernet card. See if that gets it going. All commands are without the quotes.

Do you have IPv6 enabled or disabled? It may be causing timeouts. To see if it is running, in a konsole run the command '/sbin/lsmod | grep ipv6' If there are listed modules, then the modules are loaded, and may be causing timeouts. In most cases you can disable it, and see if that helps. There are many tips on how to disable it, so search the board, if you decide you want to disable it. You can always enable it, if that proves not to be a problem.

Hope this gets you started in finding the problem.
Old 02-01-2008, 10:46 AM   #3
Registered: May 2007
Distribution: Kubuntu
Posts: 40

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Rep: Reputation: 15

Totally inexplicably to be me, the problem seems to have resolved itself. It happened once more since I posted this, then never again. I don't know what might have done it, but it could have been any number of things since I was still setting up my system at the time.

Thanks you anyway,


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