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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)
iptables is the userspace command line program used to configure the Linux 2.4.x and 2.6.x IPv4 packet filtering ruleset. It is targeted towards system administrators.
PF (Packet Filter) is OpenBSD's system for filtering TCP/IP traffic, doing Network Address Translation, normalizing and conditioning TCP/IP traffic and providing bandwidth control and packet prioritization. PF has also been ported to FreeBSD, NetBSD, and DragonFly BSD, and is an integral part of MirBSD.
pfSense is a free, open source customized distribution of FreeBSD tailored for use as a firewall and router. In addition to being a powerful, flexible firewalling and routing platform, it includes a long list of related features and a package system allowing further expandability without adding ... [More]
IPCop Linux is a complete Linux distribution whose sole purpose is to protect the networks on which it is installed.
m0n0wall (monowall) is a project aimed at creating a complete, embedded firewall software package that, when used together with an embedded PC, provides all the important features of commercial firewall boxes (including ease of use) at a fraction of the price (free software). m0n0wall is based on a ... [More]
Untangle delivers an integrated family of applications that help you simplify and consolidate the network and security products you need, in one place at the network gateway. The most popular applications let businesses block spam, spyware, viruses, and phish, filter out inappropriate web content ... [More]
FireHOL is a stateful iptables packet filtering firewall configurator. It is abstracted, extensible, easy and powerful. It can handle any kind of firewall, but most importantly, it gives you the means to configure it, the same way you think of it.
DenySSH monitors the auth log of a BSD system for failed SSH login attempts and adds repeat attackers to a Packet Filter table, allowing you to define PF rules to block the attacking hosts or redirect them to a honeypot for your amusement.