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Building a powerful & affordable firewall with Linux

It's no doubt that one of the leaders for network equipment is Cisco Systems. Newer Cisco devices are starting to use what Cisco calls its "IOS-XE" operating system, which is a customized flavor of GNU/Linux. Yes, GNU/Linux, which should not come as any surprise as GNU/Linux is used on countless high level appliances and security devices.
In fact, there are hardly any appliances or security devices that run Windows for the operating system. Why? Because GNU/Linux is highly scalable, powerful, reliable, and a better overall solution than Windows.

I have always been a huge fan of using GNU/Linux for building my own firewall boxes. First, old machines like Pentium II or Pentium III boxes are perfect for this. These boxes will easily run even the latest version of GNU/Linux. The Linux kernel itself has many functions built in for network routing, traffic shaping, bridging, virtual IP addresses, and just about anything else that a firewall needs to support. And the fact that Cisco now leverages the Linux kernel for its appliances tells me that even Cisco agrees.

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