slow network

  • Thread starter Thread starter Port Man
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Port Man

I have 34 sites all connected via T-1 lines and Cisco Routers. Over
the past few days three of the sites are showing the T-1's being 95%
saturated all day. The firewall doesn't show any traffic coming
through that isn't normal, so I'm convinced that the probelm is inside
the enterprise.

I'm not sure where to start the troubleshooting process. Can anyone
give me some steps and possibly point me to open-source software to
track down the switch or PC (Windows 2000/XP) that is causing the
problems?

Thanks.

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Is the saturation on the wan or lan ports of the routers? If wan what is
there in common. If lan look at the switch directly downstream [hopefully
managed].
 
Port said:
I have 34 sites all connected via T-1 lines and Cisco Routers. Over
the past few days three of the sites are showing the T-1's being 95%
saturated all day. The firewall doesn't show any traffic coming
through that isn't normal, so I'm convinced that the probelm is inside
the enterprise.

I'm not sure where to start the troubleshooting process. Can anyone
give me some steps and possibly point me to open-source software to
track down the switch or PC (Windows 2000/XP) that is causing the
problems?

Thanks.
Click to expand...

a great tool (and FREE, too) is ntop. You can install it on a hub or
monitor port on a managed switch (monitoring the traffic on the input
side of your T1 router). It shows all traffic by IP address as well as
connections between hosts, arps, etc. and identifies suspicious traffic.
You can quickly determine if someone is streaming video or other
high-bandwidth traffic across the WAN.

ntop runs on most linux distributions. There's also bandwidthd. If you
want a Windows solution, look at PRTG, it'll do the same thing, even a
bit prettier and no configuration file to edit as with either of the two
Linux apps. Very reasonably priced. Google.

....kurt
 
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