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Linux Exposed: Basic Firewall Functionality Explained

Jan 17, 2005, 13:00 (0 Talkback[s])

[ Thanks to Jermey for this link. ]

"Most people are familiar with the term firewall and realize that it is a device or system that keeps unwanted people and data out of computer systems or networks. However, the word means slightly different things to different people. This can lead to difficulty when discussing the concept. If you ask home users whether they have a firewall, they will probably think first of a software program installed on their home computers, like BlackICE Defender or ZoneAlarm, referred to as personal firewalls. At most they might have a Linksys dedicated router/firewall. These utilities range in price from $50 to 100. Ask a small office network administrator about firewall, and the person will probably think of something like the NETGEAR or NetScreen router/firewall, or a stronger, dedicated router/firewall system running software like SmoothWall or Astaro Linux. These are often referred to as small office/home office (SOHO) firewalls and cost anywhere from $100 to a few hundred dollars. Meanwhile, if an enterprise security specialist is asked what firewall means, he or she will think more of the heavy-duty enterprise network firewall systems such as a Cisco PIX, Check Point, or SunScreen, costing hundreds to thousands of dollars..."

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