Red Hat LINUX ES 2.1 -, Installation Manual

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Chapter 3. Installing Red Hat Enterprise Linux ES 35
Figure 3-12. 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.
Medium