Linux Iptables Block Ip

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Linux iptables, quick, simple and effective way to block an ip address or subnet range.

Syntax for Linux iptables command to block or drop an ip address

iptables -A INPUT -s IP-ADDRESS -j DROP

Example for Linux iptables command to block and ip

# iptables -A INPUT -s 65.55.44.100 -j DROP

Example for Linux iptables command to block a port for a specific ip address

# iptables -A INPUT -s 65.55.44.100 -p tcp --destination-port 25 -j DROP

Example to remove or unblock and ip address from the iptables list

# iptables -D INPUT -s xx.xxx.xx.xx -j DROP # iptables -D INPUT -s 65.55.44.100 -j DROP

Remember to safe your iptables!

# service iptables save

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