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This cheat sheet-style guide provides a quick reference to iptables commands that will create firewall rules are useful in common, everyday scenarios. This includes iptables examples of allowing and blocking various services by port, network interface, and source IP address. In computing, a firewall is a network security system that monitors and controls the incoming and outgoing network traffic based on predetermined security rules. A firewall typically establishes a barrier between a trusted, secure internal network and another outside network, such as the Internet, that is assumed to not be secure or trusted.

  • Comments which are made by the author are marked with the ‘Author’ tag, such as this one. Replies to posts are indented. Disqus comment support can be enabled via the theme options as an alternative to the default WordPress comments.

    • Replies are indented to the right of the original post, such as this one. Post administration and options can be managed via the default WordPress dashboard. The third-party Disqus comments service is also supported via the official plugin.

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