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iftop does for network usage what top(1) does for CPU usage. It listens to network traffic on a named interface and displays a table of current bandwidth usage by pairs of hosts. Handy for answering the question "why is our ADSL link so slow?".
ClearOS is an integrated network server gateway solution for small and distributed organizations. The software provides all the necessary server tools to run an organization including email, antivirus, antispam, file sharing, groupware, VPN, firewall, intrusion detection/prevention, content ... [More]
Simply shows how much of your packet data quota you've used so far this month. On the first of each month (or whenever your quota resets on billing day), clear the packet data counter. For example: Tools -> Log -> Packet data -> Options -> Clear counters
vnStat is a console-base network traffic monitor that keeps a log of daily and monthly network traffic for the selected interface. However, it isn't a packet sniffer. The traffic information is analyzed from the /proc -filesystem, so that vnStat can be used without root permissions.
Iperf was developed by NLANR/DAST as a modern alternative for measuring maximum TCP and UDP bandwidth performance. Iperf allows the tuning of various parameters and UDP characteristics. Iperf reports bandwidth, delay jitter, datagram loss.
Flowgrind is a tool similar to iperf, netperf to measure throughput and other metrics for TCP. It features some unique characteristics which are of use when exploring the idiosyncrasies of wireless mesh networks.