Securing Linux Systems: Host-Based Firewalls and Iptables Configuration

This article provides information and recommendations for securing Linux operating systems with host-based firewalls. This article aims to provide readers with a template for constructing a host-based firewall that provides a useful layer of protection against the risks of exposing a system to internal and/or external users. Additionally, readers can gain an understanding of construction methods for host-based firewalls in general and Linux-based firewalls in particular. This article targets an intermediate audience. . . . This article provides information and recommendations for securing Linux operating systems with host-based firewalls. This article aims to provide readers with a template for constructing a host-based firewall that provides a useful layer of protection against the risks of exposing a system to internal and/or external users. Additionally, readers can gain an understanding of construction methods for host-based firewalls in general and Linux-based firewalls in particular. This article targets an intermediate audience.