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Each one goes a little deeper than the previous and provides more details about the traffic.

There are basically three major types of network monitoring tools. With them, you’ll be able to measure each circuit’s utilization, analyze who and what is consuming bandwidth and drill down deep into network “conversations” to verify that everything is operating normally. Network monitoring tools let you “see” exactly what is going on on your network. For starters, everything is happening very fast and data transported on a network is invisible to the naked eye.

But as opposed to vehicular traffic where you just have to look to see if and what is wrong, seeing what’s going on on a network can be tricky. Just like network circuits can be thought of as highways, data transported on networks are like vehicles travelling on that highway. Network traffic is very similar to road traffic. Next, we’ll review the best open source tools in each of the three categories. We’ll see how bandwidth utilization monitors, network analysis systems and packet sniffers work and how they can be used to our benefit. We’ll start our discussion by talking about the need for network monitoring tools and the different types of tools that are available. Today, we’re having a look at some of the best open-source network monitoring tools. Among all the available tools, several are released in the open-source model and can generally be obtained for free. Network administrators must, therefore, use the proper tools to monitor networks and troubleshoot issues they find. Network outages and slowdowns can have major impacts on organizations. As networks are getting bigger and as corporations are more and more relying on them for their day-to-day operations, network monitoring is consequently more important than ever.