[K12OSN] LTSP slows down on subnet

Les Mikesell les at futuresource.com
Sun Jan 23 21:11:03 UTC 2005

On Sun, 2005-01-23 at 13:40, Jason Waskiewicz wrote:

> I tried out an old hub that has been in storage, but it was unacceptably
> slow. I then drove to the city and bought a switch. I had no improvement
> in speed.

Did you use the 2-NIC setup on your server with the switch and your
clients on the 2nd nic?

> When I reconnect the clients and server to the school network, they all
> speed up (although still unacceptably slow). This is true without changing
> a single setting!
> Can someone help me? I'm new to this and I can't find this particular error.

One of the worst things that can happen speed-wise is a duplex mismatch
between the NIC and switch port.  Hubs always run half-duplex; switches
can do either but you want them to use full duplex.  Most things will
negotiate this correctly these days but it is still possible to go
wrong.  Ifconfig will show if the interfaces are seeing errors, ethtool
or mii-too will show the duplex setting.   Make sure both the server
NIC and the switch port where it is connected are running in full
duplex.  If ifconfig still shows errors on the interface you probably
have a wiring problem.

  Les Mikesell
   les at futuresource.com

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