Wireshark is the world's foremost network protocol analyzer, and is the de facto (and often de jure) standard across many industries and educational institutions.
(Wireshark was known as Ethereal until June 09, 2006)
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?".
Open source web analytics framework with built in support for MediaWiki and WordPress. Built to take the pain away from repeatedly implementing web analytics for every website.
netsniff-ng is is a free, performant Linux network analyzer and networking toolkit.
The gain of performance is reached by zero-copy mechanisms, so that the kernel does not need to copy packets from kernelspace to userspace and vice versa.
netsniff-ng consists of much more than only a network
... [More] analyzer. Next to the zero-copy sniffer itself, further tools like trafgen, a powerful zero-copy network packet generator, or ifpps, a tool that provides top-like kernel networking statistics, and curvetun, a lightweight curve25519-based multiuser IP tunnel, are being shipped. [Less]
Tcpreplay is a suite of BSD licensed tools written by Aaron Turner for UNIX (and Win32 under Cygwin) operating systems which gives you the ability to use previously captured traffic in libpcap format to test a variety of network devices. It allows you to classify traffic as client or server, rewrite
... [More] Layer 2, 3 and 4 headers and finally replay the traffic back onto the network and through other devices such as switches, routers, firewalls, NIDS and IPS's. Tcpreplay supports both single and dual NIC modes for testing both sniffing and inline devices.
Tcpreplay is used by numerous firewall, IDS, IPS and other networking vendors, enterprises, universities, labs and open source projects. [Less]
ipt-netflow is high performance NetFlow exporting module for Linux kernel (up to 4.x). Designed for Linux router with heavy network load. This is netfilter/iptables module adding support for -j NETFLOW target. Designed to work efficiently w/o conntrack. Supporting NetFlow protocols v5, v9, and
... [More] IPFIX. Accounting for IPv4, IPv6 traffic, and NAT translation events (NEL). [Less]
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.
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