Do you know/recommend any tool for graphing traffic based on IP or host? In this case, I will get a graph for every IP that passes through my gateway. Of course, I will use a predefined list of source IP addresses. This is useful to monitor the traffic usage of all hosts inside your network.
I am using nagios grapher to graph the network traffic, but this tool graph the total traffic passing through the system interface(s). Nagios uses a script to monitor the traffic of the interface. After that, the traffic data is passed to nagios grapher.
I need to install such a tool on my Linux server/gateway.
You might take a look at ntop.
noah.org lists quite a few tools that are good for examining, scraping, and visualizing network traffic. So far, the one I find pretty interesting is
etherape. I even found out that some flash plugin is going to llwn.net (LimeWire!!!). I'll be checking that out. There were other tools there also that I liked but haven't tried out yet: darkstat, and ttt. Both are on noah.org. "ttt" will also graph your bandwidth by protocol.Turns out that llwn.net is a CDN for rhapsody.com. Whew!
mrtg, pastmon, etherape, argus try Google for more.
Explore for Cacti. It's a really good tool and opensource.