User's Manual

44 Chapter 3:Installing Red Hat Linux
Figure 3–10 Firewall Configuration
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.