GNUCITIZEN is a Cutting-edge Ethical Hacker Outfit. We hack things for a living. To hack does not necessarily mean to crack into something illegally. We don’t do that! Not the illegal part. We get paid to hack, which is a hack on its own. As you will learn by reading our blog, hacking is mostly about finding creative solutions to interesting problems. Sometimes these problems are related to breaking into protected computer networks, sometimes they are related to other things such as influencing a large number of people to believe in made up values. Hacking is all about creativity or finding creative solutions to interesting problems. This is exactly what GNUCITIZEN stands behind.
NetStumbler (also known as Network Stumbler) is a tool for Windows that facilitates detection of Wireless LANs using the 802.11b, 802.11a and 802.11g WLAN standards. It runs on Microsoft Windows 98 and above. A trimmed-down version called MiniStumbler is available for Windows CE.
NetStumbler is commonly used for: Wardriving, verifying network configurations, finding locations with poor coverage in one’s WLAN, detecting causes of wireless interference, detecting unauthorized (”rogue”) access points, aiming directional antennas for long-haul WLAN links
netfilter.org is home to the software of the packet filtering framework inside the Linux 2.4.x and 2.6.x kernel series. Software commonly associated with netfilter.org is iptables.
Bruce Schneier is an internationally renowned security technologist and author. Described by The Economist as a "security guru," Schneier is best known as a refreshingly candid and lucid security critic and commentator.
httptunnel creates a bidirectional virtual data connection tunnelled in HTTP requests. The HTTP requests can be sent via an HTTP proxy if so desired.
This can be useful for users behind restrictive firewalls. If WWW access is allowed through a HTTP proxy, it's possible to use httptunnel and, say, telnet or PPP to connect to a computer outside the firewall.
The following is an example iptables firewall that allows incoming ssh connections from an individual IP address (192.168.1.100), allows all outbound traffic, and uses stateful inspection.
Wireshark's powerful features make it the tool of choice for network troubleshooting, protocol development, and education worldwide.
Wireshark was written by an international group of networking experts, and is an example of the power of open source. It runs on Windows, Linux, UNIX, and other platforms.
It used to be known as Ethereal, and was renamed in May 2006. If you haven't upgraded to Wireshark yet you may want to take a look at the migration guide.