Re: Slow Network

Hello,

On Wed, Mar 31, 2010 at 12:50 PM, Rick Stevens <ricks@xxxxxxxx> wrote:
On 03/31/2010 09:07 AM, Oliver Ruebenacker wrote:
      Hello,

On Tue, Mar 30, 2010 at 6:28 PM, Rick Stevens<ricks@xxxxxxxx>  wrote:
On 03/30/2010 12:06 PM, Oliver Ruebenacker wrote:
       Hello,

    Since two or three days, my network connection seems to have become
much slower. Loading websites with Firefox now takes a mutliple of the
time, and I am having sporadic "no mirrors found" errors with yum. I
am running F12 on a Dell Latitude D820 laptop, and I am connected by
wire to a router. There has been no noticeable change on two Windows
machines connected to the same router. All machines connect via DCHP.

    What can I do to diagnose or fix the problem? Thanks!

First, "ifconfig -a" and look at the error counts for each interface.
If you see a lot, then you start looking at hardware (bad cables, dirty
or loose connectors, flakey NICs, etc.).

If the errors look OK, have a look at your (DSL|cable) modem's
statistics and see if there's something odd going on at the WAN side
of things.  If using cable modem or DSL, you may need to reboot your
router and/or modem.  I make a habit of doing that every six months
or so.

If you're running nscd, purge your nscd DNS cache ("nscd -i hosts").

   ifconfig shows no errors. I restarted the router and did nscd -i
hosts, and it got worse. Now, opening some pages (e.g. BBC News) takes
more than half a minute. The Windows machines connected to the same
router, on the other hand, load web pages just fine.

If you use DHCP, you need to restart the network bit on your Linux.
machine if you reboot the router.  The easiest way is to reboot the
system.  To do it manually:

       Network Manager: "sudo service NetworkManager restart"
       Classic Network: "sudo service network restart"

Thank you, this time rebooting helped a lot. I think it is still
slower than usual, but definitely faster than before.

Take care
Oliver

--
Oliver Ruebenacker, Computational Cell Biologist
Systems Biology Linker at Virtual Cell (http://vcell.org/sybil)
Turning Knowledge Data into Models
Center for Cell Analysis and Modeling
http://www.oliver.curiousworld.org
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