Originally published at: http://www.howtogeek.com/177621/the-beginners-guide-to-iptables-the-linux-firewall/
Iptables is an extremely flexible firewall utility built for Linux operating systems. Whether you’re a novice Linux geek or a system administrator, there’s probably some way that iptables can be a great use to you. Read on as we show you how to configure the most versatile Linux firewall.
It's a bit late to writing about iptables. How about a similar article on nftables coming to Linux 3.13 soon?
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