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Installing Red Hat* Enterprise Linux 4*
Intel® Server Board S5000PAL
41
Firewall Configuration
Red Hat Enterprise Linux offers firewall protection for enhanced system security. A firewall exists
between your computer and the network, and determines which resources on your computer remote
users on the network can access. A properly configured firewall can greatly increase the security of your
system.
Figure 4-16. Firewall Configuration
1) Next, you can decide whether to enable a firewall for your Red Hat Enterprise Linux system.
• No firewall
• No firewall provides complete access to your system and does no security checking. Security
checking is the disabling of access to certain services. This should only be selected if you are running
on a trusted network (not the Internet) or plan to do more firewall configuration later.
• Enable firewall
- If you choose Enable firewall, connections are not accepted by your system
(other than the default settings) that are not explicitly defined by you. By default, only connections
in response to outbound requests, such as DNS replies or DHCP requests, are allowed. If access to
services running on this machine is needed, you can choose to allow specific services through the
firewall. If you are connecting your system to the Internet, this is the safest option to choose.
2) Next, select which services, if any, should be allowed to pass through the firewall.