Tag: linux firewall

Computer technologies are being developed and designed all the time as people seek new technologies and new features we all might want to use in the future. Technologies which will ease our lives, make things simpler for us, and more efficient.

Creating technologies require resources, and finance, it is not enough to have the new computer technology idea. In order to manifest the idea into something material, something we can use, you need to create the idea, to make the technology. Well such creation is being done by companies. They have the resources, the man power, and tools to enable the idea become a reality.

This article is about those companies (well some of them). There are so many ideas popping up every day, you can’t track them all, you can’t make them all. There are companies which work on new ideas every day, and you probably heard of many of them.

Here are some of those computer technology companies:

  1. Microsoft – This company has been known for creating new technologies, they have developed the most commonly used operating system, which most of us use every day. Their Windows operating systems have created a new way of using computers, using mouse and keyboards to create a new way of computer programs. Their OS and their applications have changed the future into the computer life we know today.
  2. APPLE – Apple has always been a pioneer of computer technology solutions. They where the first to create the windows operating system for graphic designers which where the first Macintosh computers, that enable graphic designers to use a mouse and keyboard to accurately create their designs. Some would say Microsoft windows where the pioneers, but as one of those who started computers with the black screen using only text, while taking advantage of the Microsoft DOS, I can say for a face Macintosh was the first to see the light of day. Apple has always been unique, keeping to themselves, keeping their operating system’s environments closed to their own OS and applications. The I-phone cellular phone, is one of their best and common computer technology being used by many which loved their palm sized computer, which could also be used as a cell phone.
  3. SCORPIO TECHNOLOGY – This company specialising in supplying schools and the public with different types of technology kits which include solar car solutions and clock technologies. The main idea is for students to create their own devices with learned skills and enjoy those devices on their day to day life. The technology is built upon learning tools which include the study of different skills, using electrical and mechanical components. The kits include teaching aids and tools. Clocks creating using different designs, woodwork, pens etc…. Solar cars can be created using solar cells, solar modules and other different suitable components that enable the creation of solar cars.
  4. YOGGIE – Yoggie security systems, had a great innovative idea, they have created a miniature (USB / express card fit) Linux computer which held a full firewall security system, protecting against all harms, which are out there, no matter where you connect with your computer, either a secured or non secured wireless router, you will be protected. The innovative architecture was a brilliant design. Eventually the design miniatures into a chip like a cpu processor, which can be built into the laptop’s circuits to protect your laptop at all times.

This is just an example of how companies have shaped the computer technology age, we can just enjoy it.

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Linux Firewalls – well Linux is an open source based operating system and as such, programmers have developed different firewall applications for it. Some are built into the operating system distribution package, Ubuntu, Suse, Red-Hat etc…

There are also other firewall applications built as a separate software based on the Linux operating system kernel. These firewalls are like the Turtle, Zorp GPL, LutelWall, Guarddog, IPcop, SmoothWall, PfSense and more…

The best deal about all of these firewalls, is that they are all free. They are based on an open source operating system, and as such, they are free of charge. Instead of paying for a very expensive firewall device unit, you might consider, preparing a computer, with Linux operating system, and a well configured Linux based firewall.

* IPTABLES: The IPTABLES is part of the Linux kernel applications which is part of the Netfilter modules, that enables system administrators to configure the firewall tables, using chains and rules to define the firewall restrictions. The IPTABLES can only be configured by the administrator privileges done under the user “Root”.

* Turtle: This application is based on Kernel 2.4 and IPTABLES. This is a pretty simple firewall to use and understand and you can define different of the firewall elements like the zones, hosts, networks etc… You also get to manage and decide which of the services to enable. The simplicity is that you can do all that by editing an XML file or by using Webmin (Linux web interface).

The application includes:

  • — ZONES, NETWORKS, HOSTS and GROUPS definitions.
  • — Filter rules definitions based on services.
  • — New services definitions.
  • — NAT (Network Address Translation)
  • — Masquerading

* Zorp GPL: This is a proxy based firewall. This application enables the fine tuning of a proxy using a built in script language. It is using SSL, POP3 and HTTP protocols and it also supports the FTP, FINGER, WHOIS, TELNET protocols to set the rules of accessibility.

* LutelWall: This one is a high-level Linux firewall configuration tool. This tool enables an easy to use secured way to setup “Netfilter“. This tools is flexible and enables system administrators, to build a simple (home like) firewall, up to a most sophisticated and complex firewall. You can use multiple Sub-Nets, DMZ, traffic directions etc… It is a great tool for dedicated firewall systems, or a standalone system as a multifunction gateway/router/server. This is a tool that enables the use of the simplicity and ability of open source Linux operating systems.

  • Traffic features includes: Flexible traffic management, using rules, multiple external and internal interfaces, masquerade and sNAT support, easy setup of DNAT, LAN and DMZ, TOS (Type of Service) for optimizing traffic, FTP, DHCP and more.
  • Security features includes: TCP chains, blocking of many types of access and scanning protocols, TCP/IP Fingerprinting, Anti-spoof and Anti-smurf protection,  Flood protection.
  • Logging features includes: Logging FIN, Xmas, Tree, Null, ACK scan modes and any fingerprints being used.
  • Other features in additions are: Auto detection of static/dynamic connection, automatic updates for the firewall tools, showing firewall statistics in native IPTABLESexported to CSV or HTML format.

* Guarddog: This is a firewall configuration utility for Linux systems. This program is intended for both beginners and intermediate users who do not master TCP/IP networking and security. This application has a GUI (easy to use graphic user interface) that enables a simple description of what you need the firewall to do, and the system enables it, without a deep understanding of what exactly goes under the hood of it all.

* IPcop: This tool is most commonly being used on SOHO devices. This one also has a web-interface configuration panel, which is very user friendly. (IPcop Manual)

* SmoothWall: This version is a GPL Linux distribution system, designed to be an open source firewall. This application has a web-based GUI which require almost no knowledge of the Linux operating system to configure it’s firewall system. This system is based on the Red-Hat Linux distribution operating system.

* PfSense: This FreeBSD operating system based application is designated to be used as a firewall or a router. This solution offers a more cost effective advanced featured firewall for the personal computer (PC). This replaces a more commercial expensive firewall solution.

There are of course many other open source, Linux based firewall applications and systems, but those are some examples of what you can do (“do it yourself”) in terms of building your own free firewall system.

Some Additional Info

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