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Re: [K12OSN] OT: still have sluggish system



On Tue, 2006-09-12 at 11:39 -0700, Dan Young wrote:
> dahopkins comcast net wrote:
> > There is something going on with the network that is saturating my
> > gigabit switch.  The activity lights are almost solid at times.  But,
> > it is isolated to the switch.  Maybe the switch is having issues,
> > don't know.  Have completed virus scans, malware, etc with no
> > positive leads.  None of the NICs on any servers are showing dropped
> > packets, just a lot of traffic.
> 
> Are you using the traditional "LTSP on it's own segment" setup?
> 
> > I am going to start turning off services until the network goes quiet
> > and see if that tells me something.
> 
> Good idea. If that doesn't pan out, I'd start unplugging stuff until the
> traffic drops off. I've seen saturated networks caused by network loops
> (think crossover cable plugged into two ports on the same segment).
> Heck, some switches "auto-crossover" so you can plug in a
> straight-through cable to two ports to get the same effect.
> Spanning-tree, of course, takes care of this, but can be it's own sticky
> wicket. I've also seen flaky switches cause broadcast storms. You have a
> spare switch around?
> 
wireshark/ethereal can also help you diagnose network issues.  Run it on
the server against the LTSP interface and then see if some service is
sending a huge number of packets back and forth.

-Toshio

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