Firewall configuration under Linux

To view the status of a firewall:/etc/init.d/iptables status or service iptables status

1) temporary entry into force, recovery after restart
Open: Service iptables start
OFF: Service iptables stop or/etc/init.d/iptables stop

Restart:/etc/init.d/iptables restart

2) Permanent, no recovery after reboot
Open: Chkconfig iptables on
OFF: Chkconfig iptables off

When the firewall is turned on, make the following settings to open the relevant port

Modify the/etc/sysconfig/iptables file to add the following:

-A rh-firewall-1-input-m state--state new-m tcp-p TCP--dport 80-j ACCEPT
-A rh-firewall-1-input-m state--state new-m tcp-p TCP--dport 22-j ACCEPT

Firewall configuration under Linux