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Tip
Even if your computer is not part of a network, you can enter a hostname for your system. If you do
not take this opportunity to enter a name, your system will be known as
3.19. Firewall Configuration
Red Hat Linux Advanced Server offers firewall protection for enhanced system security. A firewall
exists between your computer and the network, and determines which resources on your computer re-
mote users on the network can access. A properly configured firewall can greatly increase the security
of your system.
Figure 3-15. Firewall Configuration
Choose the appropriate security level for your system.
High
If you choose High, your system will not accept connections (other than the default settings) that
are not explicitly defined by you. By default, only the following connections are allowed:
DNS replies
•
DHCP — so any network interfaces that use DHCP can be properly configured
•
If you choose High, your firewall will not allow the following:
Active mode FTP (passive mode FTP, used by default in most clients, should still work)
•
IRC DCC file transfers
•
RealAudio™
•
Remote X Window System clients
•
If you are connecting your system to the Internet, but do not plan to run a server, this is the safest
choice. If additional services are needed, you can choose Customize to allow specific services
through the firewall.
Chapter 3. Installing Red Hat Linux Advanced Server
.
localhost
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