Security

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• Quarantine firewall
  Quarantine firewall is yet another firewall that has masquerade, type-of-service, and traffic shaping features. ...
  
• ipkungfu
  ipkungfu is an iptables-based Linux firewall. The primary design goals are security, ease of use, and performance, in that order. ...
  
• Reapoff
  Regular Expression, Arbitrary Protocol, Opensource Filtering Firewall (Reapoff) is an arbitrary protocol proxy. ...
  
• iptables
  iptables is built on top of netfilter. It is an enhancement on ipchains, and is used to control packet filtering, Network Address Translation (masquerading, portforwarding, transparent proxying), and...
  
• TuxGuardian
  TuxGuardian is an application-based firewall that allows the implementation of access control policies in order to identify and control every application that tries to access the network. ...
  
• levy
  levy is a perl script which generates a basic iptables ruleset based. ...
  
• Instant Firewall
  The instant firewall is a little shell script to simplify setting up a three-way (outside-periphery-inside) firewall using ipchains. ...
  
• FK
  fk is a free software replacement for the TIS fwtk. ...
  
• PCX Firewall
  PCX Firewall is a perl script which works with several configuration files to generate 3 shell scripts (startfw, stopfw, and restartfw) which actually do the real work of the firewall. ...
  
• redWall
  redWall is a bootable CD-ROM firewall which focuses on Web-based reporting of the firewall's status. It includes Snort, snortsam, dansguardian, and support for fwbuilder, squid-guard, reporting (usin...
  
• Dwall
  Dwall is an all-purpose firewall tool to generate an iptables firewall out of a simple configuration. It contains about 80 predefined services and comes with a simple 3 zone firewall example. ...
  
• LutelWall Linux Firewall
  LutelWall (formerly known as Lutel Firewall) is high-level linux firewall configuration tool. It uses human-readable and easy to understand configuration to set up Netfilter in most secure way. Its f...
  
• iptables-p2p
  iptables-p2p is an iptables match module capable of matching various peer-to-peer networks by examining the application-layer protocol. ...
  
• Automatic Firewall Script
  Automatic Firewall is a script that will automatically configure a firewall. ...
  
• Horatio
  Horatio is a firewall authentication tool. ...
  
• Arno's IPTABLES Firewall Script
  Arno's IPTABLES Firewall Script is a secure stateful firewall for both single and multi-homed machines. It supports NAT and SNAT, port forwarding, ADSL ethernet modems with both static and dynamicall...
  
• ipt_sysrq
  ipt_sysrq is a new iptables target that allows you to do the same as the magic sysrq key on a keyboard does, but over the network. ...
  
• Firewall by Jim
  Firewall by Jim is a firewall that takes advantage of tcp_wrappers information to block users. ...
  
• gShieldConf
  gShieldConf is a small program to edit the gShield configuration files. It is written using the gtk toolkit. ...
  
• UIF
  Tool for generating optimized packetfilter rules under GPL. ...
  
• hlfl
  High Level Firewall Language (hlfl) permits writing firewalling rules using a high level language. ...
  
• AGT
  AGT is easy administration of iptables, written in c. Includes sample configuration files and startup scripts. ...
  
• firewall
  firewall is a set of scripts (firewall, fwup and fwdown) for ipchains. ...
  
• adcfw-log
  adcfw-log is a tool for analyzing firewall logs. ...
  
• fireflier
  fireflier is a firewall tool, which is built on top of the iptables framework. ...