Linux CentOS 5 Firewall __linux

1. Vi/etc/sysconfig/iptables

Way One

Add the following content

-A input-m state--state new-m tcp-p TCP--dport your port-j ACCEPT

Mode two
/sbin/iptables-i input-p TCP--dport your port-j ACCEPT
/etc/rc.d/init.d/iptables Save

Reboot the firewall for configuration to take effect

/etc/init.d/iptables Restart or service iptables restart

View ports that are already open

/etc/init.d/iptables status or service iptables status
Shutdown firewall

/etc/init.d/iptables Stop or Iptables-f
Permanently shut down or open a firewall
Chkconfig [–level] iptables off/on