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Restrict access to systems from networks
A first line of defense for a computing system is to secure its network connection. Limiting access to necessary services, such as a web server or email Internet Message Access Protocol (IMAP) server, removes any risk of vulnerabilities in other services.
The many forms of firewalls
Firewalls take many forms, from hardware appliances that intercept all network traffic before allowing sanctioned traffic to pass to a gateway machine, to software approaches that work at different layers of the communication stack (for example, the application level or the application-agnostic transport level).
Easy firewall configuration
Red Hat® Enterprise Linux® includes an easy-to-use Firewall Configuration GUI tool that can implement basic firewall profiles. It's built on top of iptables, which is built into the Linux kernel. The powerful iptables can be configured directly, bypassing the GUI, to solve complex requirements.
Security support and updates