Check iptables version:

# rpm -q iptables

Check iptable status:

# lsmod | grep ip_tables

Check iptable rule:

# iptables -L

iptables service:

# system-config-securitylevel

# service iptables status

# service iptables restart

# service iptables stop

#service ip6tables start

# service ip6tables restart

#service ip6tables stop

Example for SSH and HTTP

iptables rule:

-A INPUT -p tcp -m tcp --dport 22 -j DROP

-A INPUT -p tcp -m tcp --dport 80 -j ACCEPT