LeakTest
LeakTest is a safe and small (27k bytes), completely benign chameleon utility which can be used to simulate the presence and effect of Trojan horses, viruses, and adware/spyware running in your computer. It simply and quickly tells you whether it has been able to slip out past your firewall's outbound Trojan/Virus/Spyware protections and establish a standard TCP connection with our NanoProbe server.
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NuFW
NuFW performs an authentication of every single connections passing through the IP filter, by transparently requesting user's credentials before any filtering decision is taken. Practically, this brings the notion of user ID down to the IP layers.
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Airscanner Mobile Firewall
Airscanner Mobile Firewall for Windows Mobile Pocket PC is a low-level, bi-directional, packet filtering firewall that examines all incoming and outgoing TCP/IP traffic. This personal firewall ensures that data is permitted based on access control lists that you select from a set of predefined filters, or from filters that you create yourself. The firewall parses packets as they come in (or go out) on the wire or over the air, and it matches the data against a rule set of ports and IP addresses, URLs, etc.
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Antinat SOCKS server
Antinat is a flexible SOCKS server and client library for writing proxy-based applications. It supports SOCKS 4, SOCKS 4a, SOCKS 5, authentication, CHAP, XML firewalling, Win32, server chaining, and UDP. It also contains very experimental IPv6 support.
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BullDog Firewall
Bulldog is a powerful but lightweight firewall for heavy use systems. With many features, this firewall can be used by anyone who wants to protect his/her systems.
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ROPE
ROPE is a "match module" for Linux IpTables that allows packets to be matched using highly flexible rules, written in a simple purpose-designed scripting language. It was written initially to provide support for the next phase of the P2PWall project for controlling various styles of peer-to-peer application traffic, but is much broader than this in it's possible uses. See the Basics page for a tutorial-style overview.
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Firestarter
Firestarter is graphical firewall tool for Linux. The program aims to combine ease of use with powerful features, serving both desktop users and administrators.
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Temprules
This project allows placing rules into an iptables based policy, and having these rules expire after a set time. This is useful for opening ports after successful port knocking, or for blocking source IPs using port sentry.
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Easy Firewall Generator for IPTables
This program generates an iptables firewall script for use with the 2.4 or later linux kernel. It is intended for use on a single system connected to the Internet or a gateway system for a private, internal network. It provides a range of options, but is not intended to cover every possible situation.
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Vuurmuur Firewall
The program is basicly split into three pieces. One piece (the middle-end) converts humanly-readable rules, hosts, groups, networks, zones, interfaces and services into a iptables ruleset (or optional into a bash-script). The second part is a little daemon that converts the netfiler logs to easy readable logs, that reflect all the predefined objects described above. The third part is a Ncurses-based Gui (the front-end) in which one can manage the firewall. Most important here is the real-time feedback. Logs can be viewed in real-time, using colours for easy interpretation. Also, the current connections can be viewed in real-time. Filtering possibilities make it easy to monitor specific hosts or services.
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Filterrules
Filterrules is a program which allows you to determine the rules of a firewall in a very reliable way. It is made up of two parts: a "master", in charge of forging several IP packets, and a "slave", which listens on the other side of the firewall, and which tells to the master which packets passed through. At the end of the test, the firewall rules are displayed in the ipfw format.
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IPCop
IPCop firewall is a nice tool to protect your home computer and large corporate networks from intrusions and attacks.
IPCop implements existing technology, secure programming practices and outstanding new concepts to make it "the" Linux Distribution for protecting single home computers, to large corporate networks.
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Firewall Builder
Firewall Builder is multi-platform firewall configuration and management tool. It consists of a GUI and set of policy compilers for various firewall platforms.
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arp-sk
Designed to manipulate ARP tables of all kinds of equipment. This can be easily performed through the sending of the appropriate packet(s). Could be used for ARPspoofing, ARPoisoning ... sniffing.
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