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Ways to monitor a network (for purposes of troubleshooting)

What would be the best tools to put into place to monitor bandwidth issues on a network? Specifically the problems that we are having are slow internet connections with pages sometimes timing out, etc. I need a way to monitor this to try to find out what the real issues are.

We have a small network, a couple 1800 routers each with a T1 line. One for data and one for voice. We have a few catalyst switches and use vlans to seperate the voice from the data traffic. We use a Cisco ASA 5505 on the data network.

Let me know any info that I'm leaving out that you need. Thanks for your help.

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Re: Ways to monitor a network (for purposes of troubleshooting)

I would look at a netflow application. It will tell you the utilization of the line, who is using it, and what application they are using to fill it. There are both open source and commercial products out there. We use NFA, decent product but horrible support. Solarwinds makes a good one but you have to buy Orion as well or the Engineers Toolset. Fluke just bought somebody and I demo'ed it and liked it.

HTH

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