This how-to will teach you two commands, iftop and nethogs, that you can use to monitor network traffic on a Linux machine. You can use iftop to view traffic by individual connection, port, network segment, or remote host, which gives you a detailed accounting of all packets coming in and out of your machine.

IPTraf is a console-based network statistics utility for Linux. It gathers a variety of figures such as TCP connection packet and byte counts, interface statistics and activity indicators, TCP/UDP traffic breakdowns, and LAN station packet and byte counts. IPTraf is an IP traffic monitor that shows information on the IP traffic passing over your network.

Is your Net connection slow? Ever wonder what the hell’s going down the wire? Here are five free and effective tools to diagnose network traffic issues.

Linux is an excellent platform for network administration. If you want to monitor your network traffic, you can find many tools -- some accessible from a Web interface, others using a graphical interface -- but nothing beats the speed of the command line.

ntop is a free opensource network traffic probe that shows the network usage. ntop is based on libpcap and can run on Linux/Unix and Windows operating system. ntop provides a very easy to use a web access to navigate through ntop traffic information and get a dump of the network status.

A group called the Traffic Squeezer project released an open source application that accelerates WAN network traffic. The Traffic Squeezer software uses lossless compression and other procedures to accelerate traffic on Linux-based network devices, and it's said a port to an embedded hardware version is planned.

IPTraf is a very useful ncurses-based application that shows the traffic passing through your machine.

NTM Is a network traffic monitor for Linux (ubuntu, kubuntu, ecc). Characteristics: Integrate with linux NetworkManager; Autodisconnect when a threshold is reached; Day report; Console and Gui interface (gtk); Not need root privilege;

Traffic monitor applet for GNOME.Netspeed is an applet that shows how much traffic occurs on a specified network device (ethernet card, wireless LAN card, or dial-up).