IPTables Firewall creates the standard /etc/sysconfig/iptables file used by iptables on Redhat (and CentOS) Linux based systems. One of the most important uses of iptables is to control what networks (ip ranges) have access to your server on a per port basis. This allows you to configure your server so only the ip's you choose can connect to the servers services.

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Prevent Brute Force Attacks
Brute Force Attacks are now a normal part of every day now. I hacker uses a simple program to connect to a service like ssh. The hacker then tries a common username like "admin" or "root" and tries a commonly used password like "123456". If the login fails the hacker tries again. Brute Force Attacks are now a proven way to gain access to a server.

IPTables Firewall allows you to control access to the ssh port (and any other port you want) so when the hacker tries to connect to your ssh port, the connection fails and so the attack fails to. At the same time you can be connected via ssh and either never know, or if you happen to have the IPTables Firewall Logging turned on, you can look in the web interface or in the standard syslog message files.