saving
/sbin/service iptables save /etc/init.d/iptables save service iptables save
list current rules
iptables -nvL
drop connections coming from ip
iptables -I INPUT -s 10.10.10.10 -j DROP iptables -I INPUT -s 10.10.10.0/24 -j DROP
Whitelist an IP with a comment
iptables -I INPUT -s 207.81.73.142 -j ACCEPT -m comment --comment "phpMyAdmin access"
Whitelist port 3306 for ip 1.2.3.4
iptables -I INPUT -p tcp -s 1.2.3.4 --dport 3306 -j ACCEPT
Removing Rules
# list rules by line number iptables -n -L -v --line-numbers | less # remove rule by chain and line number iptables -D INPUT 2