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How to create a micro-firewall with kernel modules and packet filtering...
Every self-respecting Linux guru should be familiar with firewalls and how to install and configure them. With this in mind, Linux gurus also should be curious about how firewalls function and how to build a firewall of his or her own. Explaining exactly these two things is the goal of this article. Here, we attempt to write a firewall in less than 60 lines of C code. As impossible as this may sound, it actually is quite simple to do using the power of Linux kernel modules and Netfilter.
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