`iftop` is a network bandwidth monitoring utility that can be used to diagnose network performance degradation in real time. In this tutorial, we will be covering the the installation and basic usage of `iftop` on CentOS 6. This article can be used as a reference for other RPM-based Linux distributions. * A CentOS 6x x64 bit instance. * A sudo user. `iftop` is not available in the base CentOS yum repository, it is however available in the `epel` repository. Therefore, we will need to ins......