Howtoforge published a tutorial about how to monitor network usage with nload in Linux.

How to Monitor Network Usage with nload in Linux

If you are a network administrator then you will need to monitor your network bandwidth usage in day-to-day tasks. In this case, nload will help you to makes your job easier. nload is a command-line utility that can be used to monitor network traffic and bandwidth usage in real time. It visualizes the in-comming and out-going traffic using two graphs and also provides additional information like min/max network usage and total transferred data.

How to Monitor Network Usage with nload in Linux