How To Block IP Address using IPTABLES

Make sure running the iptables command as root. Example below shows how to block traffic coming from IP 1.2.3.4.

# iptables -I INPUT -s 1.2.3.4 -j DROP

Turn on some logging on those rule, we insert it at line two. Assuming the first iptables command was the at line one.

# iptables -I INPUT 2 -s 1.2.3.4 -j LOG --log-prefix "Dropped an As*hole"

References

• http://www.cyberciti.biz/faq/linux-iptables-drop/
• http://gr8idea.info/os/tutorials/security/iptables9.html

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