Firewalls When we press the OK button, the firewall configuration is updated and saved so that the machine will reboot with the new configuration in place. Lokkit There is another tool that we can use to configure the firewall on our Red Hat Linux systems. It’s called Lokkit (installed from the gnome-lokkit RPM). It is a simple to use configuration tool that asks a series of simple questions and configures the firewall according to the answers you supply. It’s not as versatile or powerful as the method we’ve just discussed, so we’ll make no more mention of it here. Note Note that Lokkit is not meant for custom firewall configuration and has fewer options than the Red Hat redhat-config-securitylevel tool. There is one significant drawback with using the Security Level Configuration or Lokkit applications to configure our packet filtering firewall; both configure only rules that selectively block incoming network traffic. Outgoing traffic and traffic that is forwarded (that is received on one network interface and sent out on another) by our Red Hat system are not checked in any way. This means that, should you have a system behind your firewall that has been compromised (hacked or maybe infected by a virus), it is free to transmit whatever it likes through your firewall. It is a good idea to configure your firewall to block selected outgoing and forwarded traffic too. For example, you may want to force all Internet access for machines behind the firewall to be handled by secure proxy servers. This can be done by blocking outgoing Internet access for all machines except the proxy servers. More detailed firewall configuration like this is done with the iptables command, so let’s look at how to do that. 428
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