Monitoring network, LAN and bandwith activity for server

Is there any good software free or commercial that anyone can recommend to monitor our server.
We host over 100 websites on a dedicated server and all the 100 IP's are on the single NIC.  What I want to do is monitor traffic to each IP and total network traffic to the server.  We had a few issues with downtime intermittently and I'm trying to isolate the problem.  Any suggestions or recommendation would be really helpful.
CobraitiAsked:
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SysExpertCommented:
Monitor bandwidth, some provide more details than others.

Here is a summary of the recommendations:
1.  PRTG (two recommendations) - http://www.paessler.com/prtg
2.  Websense - http://www.websense.com/global/en/ProductsServices/Express/
3.  8e6  - http://www.8e6.com/network-security/internet-filtering/web-use-reporting.html
4.  mrtg - http://oss.oetiker.ch/mrtg/
5.  ntop-xtra - http://www.openxtra.co.uk/freestuff/ntop-xtra.php
6.  iPrism - http://iprism.stbernard.com/
7.  NetFlow Analyzer - http://manageengine.adventnet.com/products/netflow/
8  http://www.iprevision.net/
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thecomputerdocsCommented:
If you are hosting that many sites, you may want to consider a good hardware firewall solution.
Check out the watchguard family of products.
www.watchguard.com.
Their logfile, bandwidth monitors, and reporting is wonderful!
Hope that helps.
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CobraitiAuthor Commented:
The webserver sits behind our ISP's hardware firewall (Cisco) has been reliable. Except we don't get any reports. I was thinking more of software that runs on the server itself that monitors processes, LAN, system health, network traffic etc.
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