Need network monitoring software

I need to monitor bandwidth usage by individual computers on my network.  Anyone know of any good software available for that purpose?  If possible, I'd like to have it monitor my Cisco router via SNMP to determine usage by individual IP addresses.  I know there are many tools available to monitor the Router to determine the overall usage but I'd like to have that usage broken down.

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geowilliAsked:
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lrmooreCommented:
SNMP will not give you utilization by individual IP. It will give you port utilization in total.
You can use Netflow on the router and export to ntop http://www.ntop.org
Else you can use RMON probe and monitor with something like SNMPc  http://www.castlerock.com
While invaluable tools, a network packet analyzer such as the Etherpeek product (along with ethereal, sniffer, Lanhound, etc) give you a snapshot in time, or real-time statistics but are not intended to provide historical records over a period of time.

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mckeoughCommented:
One excellant program is Etherpeek. This program will break down packets going to and from all IP addresses on your network. You can find it at the following link: http://www.wildpackets.com/products/etherpeek It is without a doubt, one of the best programs out there. It's extremely sophisticated, yet simple to use. I know a network administrator that works for Pratt and Wittney, (which has MANY users), and this is the tool he primarily uses to monitor his network. He and I both have used it and recommend it to anybody. You won't be dissappointed. The manufacturer, Wildpackets, will even let you download a demo so you can try before you buy, so you can try it for yourself and see if you like it. The download link is on the page I gave the link to.
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