First one have to install
yum install system-config-securitylevel
Now start this little tool
and adapt settings as needed.
The configuration is saved in
To test new rules restart the service
service iptables restart ; sleep 20 ; service iptables stop
Take a look, we wait for 20 seconds and stop the service automatically.
Just in case one of the rule fails and system access is blocked.
Did it work for you. Just drop a comment.