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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]

Ostinato is a cross-platform network packet and traffic generator and analyzer with a friendly GUI. It aims to be "Wireshark in Reverse" and thus become complementary to Wireshark. Features custom packet crafting with any field editing support for several protocols - L2: Ethernet, 802.3, LLC ... [More] SNAP, VLAN (with Q-in-Q) L3: ARP, IPv4, IPv6, IP-in-IP (a.k.a IP Tunneling) L4: TCP, UDP, ICMPv4, ICMPv6, IGMP, MLD L5: HTTP, SIP, RTSP, NNTP etc. Useful for both functional and performance testing. Works on Windows, Linux, BSD and Mac OS X. See the Homepage for a full list of features. [Less]

Toy Network Simulator