Blocking IP Addresses with a Firewall

Firewalls come in many different forms. Even if you use just one type of firewall, you should be familiar with the options that are available to you. Linux provides tools to let you implement several different types of firewall, but packet filter firewalls are the most popular type of Linux firewall. In Linux, iptables configures a packet-filter firewall. Knowing how to use this tool will enable you to set up a firewall, either to protect one computer or on a router to protect an entire network.

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